2021 St. Petersburg Open – Singles

{{Infobox tennis tournament event|2021|St. Petersburg Open|

| champ = {{flagicon|CRO}} Marin Čilić

| runner = {{flagicon|USA}} Taylor Fritz

| score = 7–6^(7–3), 4–6, 6–4

| draw = 28 (4{{abbr| Q | Qualifiers}} / 3{{abbr| WC | Wild Cards}})

| seeds = 8

| type = singles doubles

| before_name = St. Petersburg Open – Singles

| after_name = St. Petersburg Open – Singles

}}

Andrey Rublev was the defending champion,{{cite web|url=https://www.atptour.com/en/news/rublev-coric-st-petersburg-2020-sunday-final|title=Rublev Reigns In Russia|website=ATP Tour|date=18 October 2020}} but lost in the quarterfinals to Botic van de Zandschulp.

Marin Čilić won the title, defeating Taylor Fritz in the final, 7–6^(7–3), 4–6, 6–4.

Seeds

The top four seeds received a bye into the second round.

{{columns-list|colwidth=30em|

{{flagicon|RUS}} Andrey Rublev (quarterfinals)
{{flagicon|CAN}} Denis Shapovalov (quarterfinals)
{{flagicon|ESP}} Roberto Bautista Agut (quarterfinals)
{{flagicon|RUS}} Aslan Karatsev (second round)
{{flagicon|USA}} Taylor Fritz (final)
{{flagicon|RUS}} Karen Khachanov (second round)
{{flagicon|KAZ}} Alexander Bublik (second round)
{{flagicon|USA}} Sebastian Korda (second round)

}}

Draw

=Finals=

{{4TeamBracket-Tennis3-v2

|RD1=Semifinals

|RD2=Final

|team-width=175

|RD1-seed1=Q

|RD1-team1={{flagicon|NED}} Botic van de Zandschulp

|RD1-score1-1=3

|RD1-score1-2=3

|RD1-score1-3=

|RD1-seed2=

|RD1-team2={{flagicon|CRO}} Marin Čilić

|RD1-score2-1=6

|RD1-score2-2=6

|RD1-score2-3=

|RD1-seed3=5

|RD1-team3={{flagicon|USA}} Taylor Fritz

|RD1-score3-1=5

|RD1-score3-2=6

|RD1-score3-3=6

|RD1-seed4=

|RD1-team4={{flagicon|GER}} Jan-Lennard Struff

|RD1-score4-1=7

|RD1-score4-2=1

|RD1-score4-3=3

|RD2-seed1=

|RD2-team1={{flagicon|CRO}} Marin Čilić

|RD2-score1-1=7⁷

|RD2-score1-2=4

|RD2-score1-3=6

|RD2-seed2=5

|RD2-team2={{flagicon|USA}} Taylor Fritz

|RD2-score2-1=6³

|RD2-score2-2=6

|RD2-score2-3=4

}}

=Top half=

{{16TeamBracket-Compact-Tennis3-Byes

| RD1=First round

| RD2=Second round

| RD3=Quarterfinals

| RD4=Semifinals

| RD1-seed03=

| RD1-team03={{flagicon|SRB}} L Đere

| RD1-score03-1=3

| RD1-score03-2=2

| RD1-score03-3=

| RD1-seed04=

| RD1-team04={{flagicon|BLR}} I Ivashka

| RD1-score04-1=6

| RD1-score04-2=6

| RD1-score04-3=

| RD1-seed05=Q

| RD1-team05={{flagicon|NED}} B van de Zandschulp

| RD1-score05-1=6

| RD1-score05-2=6

| RD1-score05-3=

| RD1-seed06=Q

| RD1-team06={{flagicon|JPN}} Y Nishioka

| RD1-score06-1=2

| RD1-score06-2=2

| RD1-score06-3=

| RD1-seed07=WC

| RD1-team07={{flagicon|CRO}} N Serdarušić

| RD1-score07-1=6²

| RD1-score07-2=5

| RD1-score07-3=

| RD1-seed08=8

| RD1-team08={{flagicon|USA}} S Korda

| RD1-score08-1=7⁷

| RD1-score08-2=7

| RD1-score08-3=

| RD1-seed11=Q

| RD1-team11={{flagicon|BLR}} E Gerasimov

| RD1-score11-1=5

| RD1-score11-2=4

| RD1-score11-3=

| RD1-seed12=

| RD1-team12={{flagicon|USA}} M McDonald

| RD1-score12-1=7

| RD1-score12-2=6

| RD1-score12-3=

| RD1-seed13=

| RD1-team13={{flagicon|CRO}} M Čilić

| RD1-score13-1=6

| RD1-score13-2=6

| RD1-score13-3=

| RD1-seed14=

| RD1-team14={{flagicon|ESP}} A Ramos Viñolas

| RD1-score14-1=2

| RD1-score14-2=3

| RD1-score14-3=

| RD1-seed15=

| RD1-team15={{flagicon|FRA}} A Mannarino

| RD1-score15-1=3

| RD1-score15-2=3

| RD1-score15-3=

| RD1-seed16=6

| RD1-team16={{flagicon|RUS}} K Khachanov

| RD1-score16-1=6

| RD1-score16-2=6

| RD1-score16-3=

| RD2-seed01=1

| RD2-team01={{flagicon|RUS}} A Rublev

| RD2-score01-1=6

| RD2-score01-2=6

| RD2-score01-3=

| RD2-seed02=

| RD2-team02={{flagicon|BLR}} I Ivashka

| RD2-score02-1=4

| RD2-score02-2=4

| RD2-score02-3=

| RD2-seed03=Q

| RD2-team03={{flagicon|NED}} B van de Zandschulp

| RD2-score03-1=6

| RD2-score03-2=7

| RD2-score03-3=

| RD2-seed04=8

| RD2-team04={{flagicon|USA}} S Korda

| RD2-score04-1=2

| RD2-score04-2=5

| RD2-score04-3=

| RD2-seed05=3

| RD2-team05={{flagicon|ESP}} R Bautista Agut

| RD2-score05-1=6

| RD2-score05-2=6

| RD2-score05-3=

| RD2-seed06=

| RD2-team06={{flagicon|USA}} M McDonald

| RD2-score06-1=3

| RD2-score06-2=2

| RD2-score06-3=

| RD2-seed07=

| RD2-team07={{flagicon|CRO}} M Čilić

| RD2-score07-1=6

| RD2-score07-2=6¹

| RD2-score07-3=6

| RD2-seed08=6

| RD2-team08={{flagicon|RUS}} K Khachanov

| RD2-score08-1=4

| RD2-score08-2=7⁷

| RD2-score08-3=4

| RD3-seed01=1

| RD3-team01={{flagicon|RUS}} A Rublev

| RD3-score01-1=3

| RD3-score01-2=4

| RD3-score01-3=

| RD3-seed02=Q

| RD3-team02={{flagicon|NED}} B van de Zandschulp

| RD3-score02-1=6

| RD3-score02-2=6

| RD3-score02-3=

| RD3-seed03=3

| RD3-team03={{flagicon|ESP}} R Bautista Agut

| RD3-score03-1=4

| RD3-score03-2=6

| RD3-score03-3=3

| RD3-seed04=

| RD3-team04={{flagicon|CRO}} M Čilić

| RD3-score04-1=6

| RD3-score04-2=3

| RD3-score04-3=6

| RD4-seed01=Q

| RD4-team01={{flagicon|NED}} B van de Zandschulp

| RD4-score01-1=3

| RD4-score01-2=3

| RD4-score01-3=

| RD4-seed02=

| RD4-team02={{flagicon|CRO}} M Čilić

| RD4-score02-1=6

| RD4-score02-2=6

| RD4-score02-3=

}}

=Bottom half=

{{16TeamBracket-Compact-Tennis3-Byes

| RD1=First round

| RD2=Second round

| RD3=Quarterfinals

| RD4=Semifinals

| RD1-seed01=5

| RD1-team01={{flagicon|USA}} T Fritz

| RD1-score01-1=6

| RD1-score01-2=6

| RD1-score01-3=

| RD1-seed02=Q

| RD1-team02={{flagicon|FIN}} E Ruusuvuori

| RD1-score02-1=1

| RD1-score02-2=4

| RD1-score02-3=

| RD1-seed03=

| RD1-team03={{flagicon|ESP}} P Martínez

| RD1-score03-1=3

| RD1-score03-2=2

| RD1-score03-3=

| RD1-seed04=

| RD1-team04={{flagicon|USA}} T Paul

| RD1-score04-1=6

| RD1-score04-2=6

| RD1-score04-3=

| RD1-seed05=

| RD1-team05={{flagicon|AUS}} J Millman

| RD1-score05-1=6

| RD1-score05-2=6

| RD1-score05-3=

| RD1-seed06=WC

| RD1-team06={{flagicon|ISR}} Y Oliel

| RD1-score06-1=1

| RD1-score06-2=1

| RD1-score06-3=

| RD1-seed09=7

| RD1-team09={{flagicon|KAZ}} A Bublik

| RD1-score09-1=6

| RD1-score09-2=6

| RD1-score09-3=

| RD1-seed10=WC

| RD1-team10={{flagicon|RUS}} E Tiurnev

| RD1-score10-1=3

| RD1-score10-2=4

| RD1-score10-3=

| RD1-seed11=

| RD1-team11={{flagicon|GER}} J-L Struff

| RD1-score11-1=7⁷

| RD1-score11-2=6

| RD1-score11-3=

| RD1-seed12=

| RD1-team12={{flagicon|AUS}} J Duckworth

| RD1-score12-1=6³

| RD1-score12-2=3

| RD1-score12-3=

| RD1-seed13=

| RD1-team13={{flagicon|ARG}} F Delbonis

| RD1-score13-1=2

| RD1-score13-2=6¹

| RD1-score13-3=

| RD1-seed14=PR

| RD1-team14={{flagicon|ESP}} P Andújar

| RD1-score14-1=6

| RD1-score14-2=7⁷

| RD1-score14-3=

| RD2-seed01=5

| RD2-team01={{flagicon|USA}} T Fritz

| RD2-score01-1=7⁷

| RD2-score01-2=6

| RD2-score01-3=

| RD2-seed02=

| RD2-team02={{flagicon|USA}} T Paul

| RD2-score02-1=6³

| RD2-score02-2=4

| RD2-score02-3=

| RD2-seed03=

| RD2-team03={{flagicon|AUS}} J Millman

| RD2-score03-1=6

| RD2-score03-2=6

| RD2-score03-3=

| RD2-seed04=4

| RD2-team04={{flagicon|RUS}} A Karatsev

| RD2-score04-1=3

| RD2-score04-2=2

| RD2-score04-3=

| RD2-seed05=7

| RD2-team05={{flagicon|KAZ}} A Bublik

| RD2-score05-1=4

| RD2-score05-2=3

| RD2-score05-3=

| RD2-seed06=

| RD2-team06={{flagicon|GER}} J-L Struff

| RD2-score06-1=6

| RD2-score06-2=6

| RD2-score06-3=

| RD2-seed07=PR

| RD2-team07={{flagicon|ESP}} P Andújar

| RD2-score07-1=6

| RD2-score07-2=3

| RD2-score07-3=0

| RD2-seed08=2

| RD2-team08={{flagicon|CAN}} D Shapovalov

| RD2-score08-1=2

| RD2-score08-2=6

| RD2-score08-3=6

| RD3-seed01=5

| RD3-team01={{flagicon|USA}} T Fritz

| RD3-score01-1=6

| RD3-score01-2=6

| RD3-score01-3=

| RD3-seed02=

| RD3-team02={{flagicon|AUS}} J Millman

| RD3-score02-1=4

| RD3-score02-2=2

| RD3-score02-3=

| RD3-seed03=

| RD3-team03={{flagicon|GER}} J-L Struff

| RD3-score03-1=6

| RD3-score03-2=6

| RD3-score03-3=

| RD3-seed04=2

| RD3-team04={{flagicon|CAN}} D Shapovalov

| RD3-score04-1=4

| RD3-score04-2=3

| RD3-score04-3=

| RD4-seed01=5

| RD4-team01={{flagicon|USA}} T Fritz

| RD4-score01-1=5

| RD4-score01-2=6

| RD4-score01-3=6

| RD4-seed02=

| RD4-team02={{flagicon|GER}} J-L Struff

| RD4-score02-1=7

| RD4-score02-2=1

| RD4-score02-3=3

}}

Qualifying

=Seeds=

{{columns-list|colwidth=30em|

{{flagicon|NED}} Botic van de Zandschulp (qualified)
{{flagicon|FRA}} Benjamin Bonzi (first round)
{{flagicon|ARG}} Federico Coria (first round)
{{flagicon|SRB}} Miomir Kecmanović (qualifying competition)
{{flagicon|FIN}} Emil Ruusuvuori (qualified)
{{flagicon|JPN}} Yoshihito Nishioka (qualified)
{{flagicon|SWE}} Mikael Ymer (first round)
{{flagicon|BLR}} Egor Gerasimov (qualified)

}}

=Qualifiers=

{{columns-list|colwidth=30em|

{{flagicon|NED}} Botic van de Zandschulp
{{flagicon|FIN}} Emil Ruusuvuori
{{flagicon|BLR}} Egor Gerasimov
{{flagicon|JPN}} Yoshihito Nishioka

}}

=Qualifying draw=

==First qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=1

| RD1-team1={{flagicon|NED}} Botic van de Zandschulp

| RD1-score1-1=6

| RD1-score1-2=

| RD1-score1-3=

| RD1-seed2=Alt

| RD1-team2={{flagicon|AUS}} Marc Polmans

| RD1-score2-1=6^r

| RD1-score2-2=

| RD1-score2-3=

| RD1-seed3=Alt

| RD1-team3={{flagicon|RUS}} Evgeny Donskoy

| RD1-score3-1=6

| RD1-score3-2=7

| RD1-score3-3=

| RD1-seed4=7

| RD1-team4={{flagicon|SWE}} Mikael Ymer

| RD1-score4-1=2

| RD1-score4-2=5

| RD1-score4-3=

| RD2-seed1=1

| RD2-team1={{flagicon|NED}} Botic van de Zandschulp

| RD2-score1-1=5

| RD2-score1-2=6

| RD2-score1-3=6

| RD2-seed2=Alt

| RD2-team2={{flagicon|RUS}} Evgeny Donskoy

| RD2-score2-1=7

| RD2-score2-2=3

| RD2-score2-3=2

}}

==Second qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=2

| RD1-team1={{flagicon|FRA}} Benjamin Bonzi

| RD1-score1-1=6

| RD1-score1-2=6⁴

| RD1-score1-3=2

| RD1-seed2=WC

| RD1-team2={{flagicon|KAZ}} Dmitry Popko

| RD1-score2-1=4

| RD1-score2-2=7⁷

| RD1-score2-3=6

| RD1-seed3=PR

| RD1-team3={{flagicon|FRA}} Gilles Simon

| RD1-score3-1=0

| RD1-score3-2=3

| RD1-score3-3=

| RD1-seed4=5

| RD1-team4={{flagicon|FIN}} Emil Ruusuvuori

| RD1-score4-1=6

| RD1-score4-2=6

| RD1-score4-3=

| RD2-seed1=WC

| RD2-team1={{flagicon|KAZ}} Dmitry Popko

| RD2-score1-1=6²

| RD2-score1-2=4

| RD2-score1-3=

| RD2-seed2=5

| RD2-team2={{flagicon|FIN}} Emil Ruusuvuori

| RD2-score2-1=7⁷

| RD2-score2-2=6

| RD2-score2-3=

}}

==Third qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=3

| RD1-team1={{flagicon|ARG}} Federico Coria

| RD1-score1-1=3

| RD1-score1-2=4

| RD1-score1-3=

| RD1-seed2=

| RD1-team2={{flagicon|MDA}} Radu Albot

| RD1-score2-1=6

| RD1-score2-2=6

| RD1-score2-3=

| RD1-seed3=

| RD1-team3={{flagicon|BIH}} Damir Džumhur

| RD1-score3-1=1

| RD1-score3-2=6⁶

| RD1-score3-3=

| RD1-seed4=8

| RD1-team4={{flagicon|BLR}} Egor Gerasimov

| RD1-score4-1=6

| RD1-score4-2=7⁸

| RD1-score4-3=

| RD2-seed1=

| RD2-team1={{flagicon|MDA}} Radu Albot

| RD2-score1-1=6²

| RD2-score1-2=4

| RD2-score1-3=

| RD2-seed2=8

| RD2-team2={{flagicon|BLR}} Egor Gerasimov

| RD2-score2-1=7⁷

| RD2-score2-2=6

| RD2-score2-3=

}}

==Fourth qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=4

| RD1-team1={{flagicon|SRB}} Miomir Kecmanović

| RD1-score1-1=2

| RD1-score1-2=6

| RD1-score1-3=6

| RD1-seed2=WC

| RD1-team2={{flagicon|RUS}} Evgeny Karlovskiy

| RD1-score2-1=6

| RD1-score2-2=4

| RD1-score2-3=1

| RD1-seed3=Alt

| RD1-team3={{flagicon|RUS}} Roman Safiullin

| RD1-score3-1=5

| RD1-score3-2=2

| RD1-score3-3=

| RD1-seed4=6

| RD1-team4={{flagicon|JPN}} Yoshihito Nishioka

| RD1-score4-1=7

| RD1-score4-2=6

| RD1-score4-3=

| RD2-seed1=4

| RD2-team1={{flagicon|SRB}} Miomir Kecmanović

| RD2-score1-1=3

| RD2-score1-2=6

| RD2-score1-3=2

| RD2-seed2=6

| RD2-team2={{flagicon|JPN}} Yoshihito Nishioka

| RD2-score2-1=6

| RD2-score2-2=4

| RD2-score2-3=6

}}

References

[http://www.protennislive.com/posting/2021/568/mds.pdf Main draw]
[http://www.protennislive.com/posting/2021/568/qs.pdf Qualifying draw]

Category:2021 ATP Tour

2021 Singles