1940 U.S. National Championships – Men's singles
{{Use mdy dates|date=July 2023}}
{{Use American English|date=July 2023}}
{{Infobox tennis tournament event|1940|U.S. National Championships|
| champ = {{flagicon|USA}} Donald McNeill{{cite book|last=Collins|first=Bud|title=The Bud Collins History of Tennis|year=2010|publisher=New Chapter Press|location=[New York City]|isbn=978-0942257700|edition=2nd|page=459}}
| runner = {{flagicon|USA}} Bobby Riggs
| score = 4–6, 6–8, 6–3, 6–3, 7–5
| draw = 78
| seeds = 10
}}
Donald McNeill defeated Bobby Riggs 4–6, 6–8, 6–3, 6–3, 7–5 in the final to win the men's singles tennis title at the 1940 U.S. National Championships.{{cite book|last=Talbert|first=Bill|title=Tennis Observed – The USLTA Men's Singles Champions, 1881-1966|year=1967|oclc=172306|publisher=Barre Publishers|location=Barre|page=118}}
Seeds
The seeded players are listed below. Donald McNeill is the champion; others show the round in which they were eliminated.
{{colbegin}}
- {{flagicon|USA}} Bobby Riggs (finalist)
- {{flagicon|USA}} Donald McNeill (champion)
- {{flagicon|USA}} Francis Kovacs (quarterfinals)
- {{flagicon|USA}} Frank Parker (quarterfinals)
- {{flagicon|USA}} Joseph Hunt (semifinals)
- {{flagicon|USA}} Henry Prusoff (fourth round)
- {{flagicon|USA}} Bryan Grant (fourth round)
- {{flagicon|USA}} Elwood Cooke (quarterfinals)
- {{flagicon|USA}} Gardnar Mulloy (first round)
- {{flagicon|USA}} Welby Van Horn (second round)
{{colend}}
Draw
=Key=
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- r = Retired
=Final eight=
{{8TeamBracket-Tennis5
| team-width=150
| RD3-team1={{flagicon|USA}} Bobby Riggs
| RD3-seed1=1
| RD3-team2={{flagicon|USA}} Donald McNeill
| RD3-seed2=2
| RD3-score1-1=6
| RD3-score2-1=4
| RD3-score1-2=8
| RD3-score2-2=6
| RD3-score1-3=3
| RD3-score2-3=6
| RD3-score1-4=3
| RD3-score2-4=6
| RD3-score1-5=5
| RD3-score2-5=7
| RD2-team1={{flagicon|USA}} Joseph Hunt
| RD2-seed1=5
| RD2-team2={{flagicon|USA}} Bobby Riggs
| RD2-seed2=1
| RD2-score1-1=6
| RD2-score2-1=4
| RD2-score1-2=3
| RD2-score2-2=6
| RD2-score1-3=7
| RD2-score2-3=5
| RD2-score1-4=3
| RD2-score2-4=6
| RD2-score1-5=4
| RD2-score2-5=6
| RD2-team3={{flagicon|USA}} Jack Kramer
| RD2-seed3=
| RD2-team4={{flagicon|USA}} Donald McNeill
| RD2-seed4=2
| RD2-score3-1=1
| RD2-score4-1=6
| RD2-score3-2=7
| RD2-score4-2=5
| RD2-score3-3=4
| RD2-score4-3=6
| RD2-score3-4=3
| RD2-score4-4=6
| RD1-team1={{flagicon|USA}} Joseph Hunt
| RD1-seed1=5
| RD1-team2={{flagicon|USA}} Francis Kovacs
| RD1-seed2=3
| RD1-score1-1=6
| RD1-score2-1=4
| RD1-score1-2=6
| RD1-score2-2=1
| RD1-score1-3=6
| RD1-score2-3=4
| RD1-team3={{flagicon|USA}} Ted Schroeder
| RD1-seed3=
| RD1-team4={{flagicon|USA}} Bobby Riggs
| RD1-seed4=1
| RD1-score3-1=1
| RD1-score4-1=6
| RD1-score3-2=7
| RD1-score4-2=5
| RD1-score3-3=3
| RD1-score4-3=6
| RD1-score3-4=4
| RD1-score4-4=6
| RD1-team5={{flagicon|USA}} Jack Kramer
| RD1-seed5=
| RD1-team6={{flagicon|USA}} Frank Parker
| RD1-seed6=4
| RD1-score5-1=1
| RD1-score6-1=6
| RD1-score5-2=6
| RD1-score6-2=1
| RD1-score5-3=3
| RD1-score6-3=6
| RD1-score5-4=6
| RD1-score6-4=3
| RD1-score5-5=6
| RD1-score6-5=1
| RD1-team7={{flagicon|USA}} Elwood Cooke
| RD1-seed7=8
| RD1-team8={{flagicon|USA}} Donald McNeill
| RD1-seed8=2
| RD1-score7-1=7
| RD1-score8-1=9
| RD1-score7-2=8
| RD1-score8-2=6
| RD1-score7-3=4
| RD1-score8-3=6
| RD1-score7-4=3
| RD1-score8-4=6
}}
=Earlier rounds=
==Section 1==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Bowden
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Hunt
| RD4-seed02=5
| RD4-score01-1=1
| RD4-score02-1=6
| RD4-score01-2=8
| RD4-score02-2=6
| RD4-score01-3=1
| RD4-score02-3=6
| RD4-score01-4=6
| RD4-score02-4=8
| RD3-team01={{flagicon|IRL}} Lyttleton-Rogers
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Bowden
| RD3-seed02=
| RD3-score01-1=6
| RD3-score02-1=4
| RD3-score01-2=6
| RD3-score02-2=4
| RD3-score01-3=3
| RD3-score02-3=6
| RD3-score01-4=4
| RD3-score02-4=6
| RD3-score01-5=4
| RD3-score02-5=6
| RD3-team03={{flagicon|USA}} Buxby
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Hunt
| RD3-seed04=5
| RD3-score03-1=5
| RD3-score04-1=7
| RD3-score03-2=6
| RD3-score04-2=3
| RD3-score03-3=4
| RD3-score04-3=6
| RD3-score03-4=1
| RD3-score04-4=6
| RD2-team01={{flagicon|USA}} Carver
| RD2-seed01=
| RD2-team02={{flagicon|IRL}} Lyttleton-Rogers
| RD2-seed02=
| RD2-score01-1=6
| RD2-score02-1=3
| RD2-score01-2=6
| RD2-score02-2=8
| RD2-score01-3=4
| RD2-score02-3=6
| RD2-score01-4=6
| RD2-score02-4=8
| RD2-team03={{flagicon|USA}} Bellis
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Bowden
| RD2-seed04=
| RD2-score03-1=1
| RD2-score04-1=6
| RD2-score03-2=4
| RD2-score04-2=6
| RD2-score03-3=6
| RD2-score04-3=2
| RD2-score03-4=6
| RD2-score04-4=1
| RD2-score03-5=6
| RD2-score04-5=8
| RD2-team05={{flagicon|ECU}} Aguirre
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Buxby
| RD2-seed06=
| RD2-score05-1=0
| RD2-score06-1=6
| RD2-score05-2=1
| RD2-score06-2=6
| RD2-score05-3=2
| RD2-score06-3=6
| RD2-team07={{flagicon|USA}} Ganzenmuller
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Hunt
| RD2-seed08=5
| RD2-score07-1=1
| RD2-score08-1=6
| RD2-score07-2=1
| RD2-score08-2=6
| RD2-score07-3=6
| RD2-score08-3=8
}}
==Section 2==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Mattmann
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Kovacs
| RD4-seed02=3
| RD4-score01-1=4
| RD4-score02-1=6
| RD4-score01-2=2
| RD4-score02-2=6
| RD4-score01-3=4
| RD4-score02-3=6
| RD3-team01={{flagicon|USA}} Mattmann
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Crowther
| RD3-seed02=
| RD3-score01-1=6
| RD3-score02-1=3
| RD3-score01-2=6
| RD3-score02-2=4
| RD3-score01-3=7
| RD3-score02-3=9
| RD3-score01-4=3
| RD3-score02-4=6
| RD3-score01-5=6
| RD3-score02-5=3
| RD3-team03={{flagicon|USA}} Seixas
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Kovacs
| RD3-seed04=3
| RD3-score03-1=7
| RD3-score04-1=5
| RD3-score03-2=9
| RD3-score04-2=7
| RD3-score03-3=4
| RD3-score04-3=6
| RD3-score03-4=4
| RD3-score04-4=6
| RD3-score03-5=1
| RD3-score04-5=6
| RD2-team01={{flagicon|USA}} Mattmann
| RD2-seed01=
| RD2-team02={{flagicon|CAN|1921}} McDiarmid
| RD2-seed02=
| RD2-score01-1=6
| RD2-score02-1=3
| RD2-score01-2=6
| RD2-score02-2=1
| RD2-score01-3=9
| RD2-score02-3=7
| RD2-team03={{flagicon|USA}} Paul
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Crowther
| RD2-seed04=
| RD2-score03-1=6
| RD2-score04-1=3
| RD2-score03-2=6
| RD2-score04-2=4
| RD2-score03-3=1
| RD2-score04-3=6
| RD2-score03-4=2
| RD2-score04-4=6
| RD2-score03-5=6
| RD2-score04-5=8
| RD2-team05={{flagicon|USA}} Vogt
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Seixas
| RD2-seed06=
| RD2-score05-1=1
| RD2-score06-1=6
| RD2-score05-2=6
| RD2-score06-2=1
| RD2-score05-3=4
| RD2-score06-3=6
| RD2-score05-4=1
| RD2-score06-4=6
| RD2-team07={{flagicon|USA}} Anderson
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Kovacs
| RD2-seed08=3
| RD2-score07-1=1
| RD2-score08-1=6
| RD2-score07-2=6
| RD2-score08-2=3
| RD2-score07-3=1
| RD2-score08-3=6
| RD2-score07-4=8
| RD2-score08-4=10
}}
==Section 3==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Schroeder
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Grant
| RD4-seed02=7
| RD4-score01-1=6
| RD4-score02-1=4
| RD4-score01-2=6
| RD4-score02-2=3
| RD4-score01-3=5
| RD4-score02-3=7
| RD4-score01-4=8
| RD4-score02-4=6
| RD3-team01={{flagicon|USA}} Schroeder
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Anderson
| RD3-seed02=
| RD3-score01-1=2
| RD3-score02-1=6
| RD3-score01-2=6
| RD3-score02-2=3
| RD3-score01-3=6
| RD3-score02-3=4
| RD3-score01-4=6
| RD3-score02-4=4
| RD3-team03={{flagicon|USA}} Hartman
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Grant
| RD3-seed04=7
| RD3-score03-1=1
| RD3-score04-1=6
| RD3-score03-2=6
| RD3-score04-2=4
| RD3-score03-3=1
| RD3-score04-3=6
| RD3-score03-4=3
| RD3-score04-4=6
| RD2-team01={{flagicon|USA}} Schroeder
| RD2-seed01=
| RD2-team02={{flagicon|USA}} Wall
| RD2-seed02=
| RD2-score01-1=6
| RD2-score02-1=3
| RD2-score01-2=6
| RD2-score02-2=0
| RD2-score01-3=7
| RD2-score02-3=5
| RD2-team03={{flagicon|USA}} Anderson
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Underwood
| RD2-seed04=
| RD2-score03-1=6
| RD2-score04-1=2
| RD2-score03-2=6
| RD2-score04-2=3
| RD2-score03-3=3
| RD2-score04-3=6
| RD2-score03-4=5
| RD2-score04-4=7
| RD2-score03-5=6
| RD2-score04-5=0
| RD2-team05={{flagicon|USA}} Harman
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Hartman
| RD2-seed06=
| RD2-score05-1=1
| RD2-score06-1=6
| RD2-score05-2=6
| RD2-score06-2=1
| RD2-score05-3=5
| RD2-score06-3=7
| RD2-score05-4=3
| RD2-score06-4=6
| RD2-team07={{flagicon|USA}} Anderson
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Grant
| RD2-seed08=7
| RD2-score07-1=3
| RD2-score08-1=6
| RD2-score07-2=3
| RD2-score08-2=6
| RD2-score07-3=9
| RD2-score08-3=11
}}
==Section 4==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Surface
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Riggs
| RD4-seed02=1
| RD4-score01-1=0
| RD4-score02-1=6
| RD4-score01-2=3
| RD4-score02-2=6
| RD4-score01-3=1
| RD4-score02-3=6
| RD3-team01={{flagicon|USA}} Davenport
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Surface
| RD3-seed02=
| RD3-score01-1=5
| RD3-score02-1=7
| RD3-score01-2=5
| RD3-score02-2=7
| RD3-score01-3=6
| RD3-score02-3=3
| RD3-score01-4=6
| RD3-score02-4=8
| RD3-team03={{flagicon|USA}} Talbert
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Riggs
| RD3-seed04=1
| RD3-score03-1=3
| RD3-score04-1=6
| RD3-score03-2=4
| RD3-score04-2=6
| RD3-score03-3=3
| RD3-score04-3=6
| RD2-team01={{flagicon|USA}} Prochaska
| RD2-seed01=
| RD2-team02={{flagicon|USA}} Davenport
| RD2-seed02=
| RD2-score01-1=1
| RD2-score02-1=6
| RD2-score01-2=1
| RD2-score02-2=6
| RD2-score01-3=3
| RD2-score02-3=6
| RD2-team03={{flagicon|USA}} Guernsey
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Surface
| RD2-seed04=
| RD2-score03-1=6
| RD2-score04-1=3
| RD2-score03-2=3
| RD2-score04-2=6
| RD2-score03-3=3
| RD2-score04-3=6
| RD2-score03-4=9
| RD2-score04-4=11
| RD2-team05={{flagicon|USA}} Steele Jr.
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Talbert
| RD2-seed06=
| RD2-score05-1=4
| RD2-score06-1=6
| RD2-score05-2=4
| RD2-score06-2=6
| RD2-score05-3=3
| RD2-score06-3=6
| RD2-team07={{flagicon|USA}} Sutter
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Riggs
| RD2-seed08=1
| RD2-score07-1=2
| RD2-score08-1=6
| RD2-score07-2=2
| RD2-score08-2=6
| RD2-score07-3=6
| RD2-score08-3=8
| RD1-team03={{flagicon|USA}} Podesta
| RD1-seed03=
| RD1-team04={{flagicon|USA}} Davenport
| RD1-seed04=
| RD1-score03-1=6
| RD1-score04-1=3
| RD1-score03-2=6
| RD1-score04-2=8
| RD1-score03-3=9
| RD1-score04-3=11
| RD1-score03-4=4
| RD1-score04-4=6
| RD1-team05={{flagicon|USA}} Shields
| RD1-seed05=
| RD1-team06={{flagicon|USA}} Guernsey
| RD1-seed06=
| RD1-score05-1=8
| RD1-score06-1=6
| RD1-score05-2=8
| RD1-score06-2=10
| RD1-score05-3=7
| RD1-score06-3=9
| RD1-score05-4=0
| RD1-score06-4=6
| RD1-team07={{flagicon|USA}} Mulloy
| RD1-seed07=9
| RD1-team08={{flagicon|USA}} Surface
| RD1-seed08=
| RD1-score07-1=5
| RD1-score08-1=7
| RD1-score07-2=1
| RD1-score08-2=6
| RD1-score07-3=3
| RD1-score08-3=6
| RD1-team09={{flagicon|USA}} Hawley
| RD1-seed09=
| RD1-team10={{flagicon|USA}} Steele Jr.
| RD1-seed10=
| RD1-score09-1=6
| RD1-score10-1=3
| RD1-score09-2=3
| RD1-score10-2=6
| RD1-score09-3=1
| RD1-score10-3=6
| RD1-score09-4=0
| RD1-score10-4=6
| RD1-team11={{flagicon|USA}} Smith
| RD1-seed11=
| RD1-team12={{flagicon|USA}} Talbert
| RD1-seed12=
| RD1-score11-1=2
| RD1-score12-1=6
| RD1-score11-2=1
| RD1-score12-2=6
| RD1-score11-3=2
| RD1-score12-3=6
| RD1-team13={{flagicon|USA}} Mahoney
| RD1-seed13=
| RD1-team14={{flagicon|USA}} Sutter
| RD1-seed14=
| RD1-score13-1=6
| RD1-score14-1=1
| RD1-score13-2=9
| RD1-score14-2=7
| RD1-score13-3=1
| RD1-score14-3=6
| RD1-score13-4=1
| RD1-score14-4=6
| RD1-score13-5=0
| RD1-score14-5=6
| RD1-team15={{flagicon|USA}} Lubin
| RD1-seed15=
| RD1-team16={{flagicon|USA}} Riggs
| RD1-seed16=1
| RD1-score15-1=w/o
}}
==Section 5==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Kramer
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Prusoff
| RD4-seed02=6
| RD4-score01-1=6
| RD4-score02-1=3
| RD4-score01-2=8
| RD4-score02-2=6
| RD4-score01-3=5
| RD4-score02-3=7
| RD4-score01-4=6
| RD4-score02-4=3
| RD3-team01={{flagicon|USA}} Wood
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Kramer
| RD3-seed02=
| RD3-score01-1=3
| RD3-score02-1=6
| RD3-score01-2=3
| RD3-score02-2=6
| RD3-score01-3=3
| RD3-score02-3=6
| RD3-team03={{flagicon|USA}} Amark
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Prusoff
| RD3-seed04=6
| RD3-score03-1=6
| RD3-score04-1=3
| RD3-score03-2=6
| RD3-score04-2=4
| RD3-score03-3=1
| RD3-score04-3=6
| RD3-score03-4=0
| RD3-score04-4=6
| RD3-score03-5=1
| RD3-score04-5=6
| RD2-team01={{flagicon|USA}} Wood
| RD2-seed01=
| RD2-team02={{flagicon|USA}} Low
| RD2-seed02=
| RD2-score01-1=6
| RD2-score02-1=2
| RD2-score01-2=1
| RD2-score02-2=6
| RD2-score01-3=8
| RD2-score02-3=6
| RD2-score01-4=6
| RD2-score02-4=3
| RD2-team03={{flagicon|USA}} Kramer
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Alloo
| RD2-seed04=
| RD2-score03-1=6
| RD2-score04-1=0
| RD2-score03-2=6
| RD2-score04-2=2
| RD2-score03-3=6
| RD2-score04-3=4
| RD2-team05={{flagicon|USA}} Amark
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Doeg
| RD2-seed06=
| RD2-score05-1=4
| RD2-score06-1=6
| RD2-score05-2=6
| RD2-score06-2=1
| RD2-score05-3=3
| RD2-score06-3=6
| RD2-score05-4=6
| RD2-score06-4=3
| RD2-score05-5=6
| RD2-score06-5=3
| RD2-team07={{flagicon|USA}} Hall
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Prusoff
| RD2-seed08=6
| RD2-score07-1=6
| RD2-score08-1=1
| RD2-score07-2=3
| RD2-score08-2=6
| RD2-score07-3=6
| RD2-score08-3=0
| RD2-score07-4=7
| RD2-score08-4=9
| RD2-score07-5=4
| RD2-score08-5=6
| RD1-team01={{flagicon|USA}} Decker
| RD1-seed01=
| RD1-team02={{flagicon|USA}} Wood
| RD1-seed02=
| RD1-score01-1=1
| RD1-score02-1=6
| RD1-score01-2=1
| RD1-score02-2=6
| RD1-score01-3=2
| RD1-score02-3=6
| RD1-team03={{flagicon|USA}} Price
| RD1-seed03=
| RD1-team04={{flagicon|USA}} Low
| RD1-seed04=
| RD1-score03-1=7
| RD1-score04-1=5
| RD1-score03-2=1
| RD1-score04-2=6
| RD1-score03-3=0
| RD1-score04-3=6
| RD1-score03-4=1
| RD1-score04-4=6
| RD1-team05={{flagicon|USA}} Hunt
| RD1-seed05=
| RD1-team06={{flagicon|USA}} Kramer
| RD1-seed06=
| RD1-score05-1=6
| RD1-score06-1=1
| RD1-score05-2=6
| RD1-score06-2=8
| RD1-score05-3=4
| RD1-score06-3=6
| RD1-score05-4=6
| RD1-score06-4=8
| RD1-team07={{flagicon|USA}} McGehee
| RD1-seed07=
| RD1-team08={{flagicon|USA}} Alloo
| RD1-seed08=
| RD1-score07-1=1
| RD1-score08-1=6
| RD1-score07-2=8
| RD1-score08-2=6
| RD1-score07-3=1
| RD1-score08-3=6
| RD1-score07-4=3
| RD1-score08-4=6
| RD1-team09={{flagicon|JPN}} Yamagishi
| RD1-seed09=
| RD1-team10={{flagicon|USA}} Amark
| RD1-seed10=
| RD1-score09-1=1
| RD1-score10-1=6
| RD1-score09-2=3
| RD1-score10-2=6
| RD1-score09-3=1
| RD1-score10-3=6
| RD1-team11={{flagicon|USA}} Johnson
| RD1-seed11=
| RD1-team12={{flagicon|USA}} Doeg
| RD1-seed12=
| RD1-score11-1=2
| RD1-score12-1=6
| RD1-score11-2=6
| RD1-score12-2=2
| RD1-score11-3=1
| RD1-score12-3=6
| RD1-score11-4=3
| RD1-score12-4=6
| RD1-team13={{flagicon|USA}} Froehling
| RD1-seed13=
| RD1-team14={{flagicon|USA}} Hall
| RD1-seed14=
| RD1-score13-1=6
| RD1-score14-1=1
| RD1-score13-2=6
| RD1-score14-2=1
| RD1-score13-3=2
| RD1-score14-3=6
| RD1-score13-4=3
| RD1-score14-4=6
| RD1-score13-5=3
| RD1-score14-5=6
}}
==Section 6==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Gillespie
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Parker
| RD4-seed02=4
| RD4-score01-1=2
| RD4-score02-1=6
| RD4-score01-2=3
| RD4-score02-2=6
| RD4-score01-3=8
| RD4-score02-3=10
| RD3-team01={{flagicon|USA}} Gillespie
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Bobbitt
| RD3-seed02=
| RD3-score01-1=4
| RD3-score02-1=6
| RD3-score01-2=6
| RD3-score02-2=1
| RD3-score01-3=3
| RD3-score02-3=6
| RD3-score01-4=6
| RD3-score02-4=3
| RD3-score01-5=6
| RD3-score02-5=3
| RD3-team03={{flagicon|USA}} Kelly
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Parker
| RD3-seed04=4
| RD3-score03-1=3
| RD3-score04-1=6
| RD3-score03-2=1
| RD3-score04-2=6
| RD3-score03-3=3
| RD3-score04-3=6
| RD2-team01={{flagicon|TCH}} Hecht
| RD2-seed01=
| RD2-team02={{flagicon|USA}} Gillespie
| RD2-seed02=
| RD2-score01-1=2
| RD2-score02-1=6
| RD2-score01-2=6
| RD2-score02-2=3
| RD2-score01-3=1
| RD2-score02-3=6
| RD2-score01-4=6
| RD2-score02-4=3
| RD2-score01-5=8
| RD2-score02-5=10
| RD2-team03={{flagicon|USA}} Bickel
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Bobbitt
| RD2-seed04=
| RD2-score03-1=3
| RD2-score04-1=6
| RD2-score03-2=4
| RD2-score04-2=6
| RD2-score03-3=2
| RD2-score04-3=6
| RD2-team05={{flagicon|USA}} Kelly
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Arenberg
| RD2-seed06=
| RD2-score06-1=w/o
| RD2-team07={{flagicon|ECU}} Segura{{efn|name=talbert|In his book Tennis Observed (1967) Bill Talbert lists the player's name as P. Maguire.}}
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Parker
| RD2-seed08=4
| RD2-score07-1=3
| RD2-score08-1=6
| RD2-score07-2=1
| RD2-score08-2=6
| RD2-score07-3=5
| RD2-score08-3=7
}}
==Section 7==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Olewine
| RD4-seed01=
| RD4-team02={{flagicon|USA}} Cooke
| RD4-seed02=8
| RD4-score01-1=3
| RD4-score02-1=6
| RD4-score01-2=1
| RD4-score02-2=6
| RD4-score01-3=4
| RD4-score02-3=6
| RD3-team01={{flagicon|USA}} Bartlett
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Olewine
| RD3-seed02=
| RD3-score01-1=5
| RD3-score02-1=7
| RD3-score01-2=3
| RD3-score02-2=6
| RD3-score01-3=6
| RD3-score02-3=8
| RD3-team03={{flagicon|USA}} Kantrowitz
| RD3-seed03=
| RD3-team04={{flagicon|USA}} Cooke
| RD3-seed04=8
| RD3-score03-1=3
| RD3-score04-1=6
| RD3-score03-2=1
| RD3-score04-2=6
| RD3-score03-3=3
| RD3-score04-3=6
| RD2-team01={{flagicon|USA}} Bartlett
| RD2-seed01=
| RD2-team02={{flagicon|USA}} Evert
| RD2-seed02=
| RD2-score01-1=1
| RD2-score02-1=6
| RD2-score01-2=6
| RD2-score02-2=4
| RD2-score01-3=6
| RD2-score02-3=3
| RD2-score01-4=6
| RD2-score02-4=3
| RD2-team03={{flagicon|USA}} Greenberg
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Olewine
| RD2-seed04=
| RD2-score03-1=3
| RD2-score04-1=6
| RD2-score03-2=7
| RD2-score04-2=9
| RD2-score03-3=6
| RD2-score04-3=0
| RD2-score03-4=0
| RD2-score04-4=6
| RD2-team05={{flagicon|USA}} Kantrowitz
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Martin
| RD2-seed06=
| RD2-score05-1=1
| RD2-score06-1=6
| RD2-score05-2=6
| RD2-score06-2=1
| RD2-score05-3=6
| RD2-score06-3=1
| RD2-score05-4=6
| RD2-score06-4=3
| RD2-team07={{flagicon|Republic of China (1912–1949)}} Choy
| RD2-seed07=
| RD2-team08={{flagicon|USA}} Cooke
| RD2-seed08=8
| RD2-score07-1=1
| RD2-score08-1=6
| RD2-score07-2=3
| RD2-score08-2=6
| RD2-score07-3=3
| RD2-score08-3=6
}}
==Section 8==
{{16TeamBracket-Compact-Tennis5-Byes
| RD1=First round
| RD2=Second round
| RD3=Third round
| RD4=Fourth round
| RD4-team01={{flagicon|USA}} Everett
| RD4-seed01=
| RD4-team02={{flagicon|USA}} McNeill
| RD4-seed02=2
| RD4-score01-1=3
| RD4-score02-1=6
| RD4-score01-2=3
| RD4-score02-2=6
| RD4-score01-3=1
| RD4-score02-3=6
| RD3-team01={{flagicon|USA}} O'Neill
| RD3-seed01=
| RD3-team02={{flagicon|USA}} Everett
| RD3-seed02=
| RD3-score01-1=1
| RD3-score02-1=6
| RD3-score01-2=3
| RD3-score02-2=6
| RD3-score01-3=3
| RD3-score02-3=6
| RD3-team03={{flagicon|USA}} Toley
| RD3-seed03=
| RD3-team04={{flagicon|USA}} McNeill
| RD3-seed04=2
| RD3-score03-1=3
| RD3-score04-1=6
| RD3-score03-2=3
| RD3-score04-2=6
| RD3-score03-3=1
| RD3-score04-3=6
| RD2-team01={{flagicon|USA}} O'Neill
| RD2-seed01=
| RD2-team02={{flagicon|USA}} Pryor
| RD2-seed02=
| RD2-score02-1=w/o
| RD2-team03={{flagicon|USA}} Everett
| RD2-seed03=
| RD2-team04={{flagicon|USA}} Van Horn
| RD2-seed04=10
| RD2-score03-1=3
| RD2-score04-1=6
| RD2-score03-2=5
| RD2-score04-2=7
| RD2-score03-3=6
| RD2-score04-3=1
| RD2-score03-4=6
| RD2-score04-4=0
| RD2-score03-5=15
| RD2-score04-5=13
| RD2-team05={{flagicon|USA}} Thackara
| RD2-seed05=
| RD2-team06={{flagicon|USA}} Toley
| RD2-seed06=
| RD2-score05-1=6
| RD2-score06-1=1
| RD2-score05-2=2
| RD2-score06-2=6
| RD2-score05-3=5
| RD2-score06-3=7
| RD2-score05-4=6
| RD2-score06-4=8
| RD2-team07={{flagicon|USA}} Fishbach
| RD2-seed07=
| RD2-team08={{flagicon|USA}} McNeill
| RD2-seed08=2
| RD2-score07-1=1
| RD2-score08-1=6
| RD2-score07-2=1
| RD2-score08-2=6
| RD2-score07-3=1
| RD2-score08-3=6
}}
Notes
{{notelist}}
References
{{reflist}}
External links
- [http://www.itftennis.com/procircuit/tournaments/men's-tournament/info.aspx?tournamentid=1010004524 1940 U.S. National Championships on ITFtennis.com] {{Webarchive|url=https://web.archive.org/web/20160331142621/http://www.itftennis.com/procircuit/tournaments/men%27s-tournament/info.aspx?tournamentid=1010004524 |date=2016-03-31 }}, the source for this draw
{{US Open men's singles drawsheets}}
{{US Open men's singles champions}}
{{DEFAULTSORT:1940 U.S. National Championships - Men's Singles}}
Category:U.S. National Championships (tennis) by year – Men's singles