1986 Nabisco Masters

{{Use mdy dates|date=August 2023}}

{{TennisEventInfo|1986|Nabisco Masters|

| date= 3–8 December (singles)
9–14 December (doubles)

| edition=17th (singles) / 13th (doubles)

| category=Masters

| draw=8S / 8D

| prize_money=$500,000

| venue = Madison Square Garden
Royal Albert Hall

| location= New York City (singles)
London (doubles)

| surface = Carpet / indoor

| champs={{Flagicon|TCH}} Ivan Lendl{{cite web |title=1986 Masters – Singles results |url=https://www.atptour.com/en/scores/archive/masters/605/1986/results |publisher=Association of Tennis Professionals (ATP)}}

| champd={{flagicon|SWE}} Stefan Edberg / {{flagicon|SWE}} Anders Järryd{{cite web |title=1986 Masters – Singles results |url=https://www.atptour.com/en/scores/archive/masters/605/1986/results?matchType=doubles |publisher=Association of Tennis Professionals (ATP)}}

| main_name=ATP Finals

}}

The 1986 Masters (also known as the 1986 Nabisco Masters for sponsorship reasons) was a men's tennis tournament. The singles event was played on indoor carpet courts in Madison Square Garden, New York City, United States between December 3 and December 8, 1986 while the doubles competition was held at the Royal Albert Hall from December 9 through December 14.{{cite book | last1 = Collins | first1 = Bud | authorlink1 = Bud Collins | title = The Bud Collins History of Tennis: An Authoritative Encyclopedia and Record Book | chapter = Year-End Championships | publisher = New Chapter Press | date = October 2010 | location = New York | pages = 746 | isbn = 978-0-942257-70-0}}{{cite book|title=The International Tennis Federation : World of Tennis 1987|year=1987|publisher=Willow Books|location=London|isbn=9780002182522|pages=161–164|editor=John Barrett|editor-link=John Barrett (tennis)}} It was the year-end championship of the 1986 Nabisco Grand Prix tour. It was the first edition where the round robin format, which is now associated with the event, was reintroduced. As a result the singles field was halved from 16 down to 8 competitors. It was also the first time since the inaugural edition in 1970 that no player from the United States qualified for the singles event.{{cite web|author1=Peter Alfano|title=Tennis Notebook; Foreign Accent Could Harm Masters|url=https://www.nytimes.com/1986/11/25/sports/tennis-notebook-foreign-accent-could-harm-masters.html|work=The New York Times|date=November 25, 1986}} Ivan Lendl retained the Masters title as he won it for a fourth time. Lendl defeated Becker in straight sets in a repeat of the 1985 Masters final which took place earlier in the year, in January. In the doubles competition Stefan Edberg and Anders Järryd successfully defended the title.