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The US Open men's singles championship is an annual tennis tournament that is part of the US OpenTemplate:EfnTemplate:Efn and was established in 1881. It is played on outdoor hard courtsTemplate:Efn at the USTA Billie Jean King National Tennis Center in Flushing Meadows – Corona Park, New York City, United States.<ref name=USOProfile>{{#invoke:citation/CS1|citation
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}}</ref> Newport (1881–1914), Forest Hills (1915–1920, 1924–1977), and Philadelphia (1921–1923) held the event before it settled in 1978 at the USTA National Tennis Center, now the USTA Billie Jean King National Tennis Center, in New York City.<ref name=USTAFinals>{{#invoke:citation/CS1|citation
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}}</ref> The inaugural tournament, in 1881, was reserved for United States National Lawn Tennis Association (USNLTA) club members, before the championships opened to international competitors in 1882.<ref name=2008USOHistory/> The USTA is the national body that organizes this event.
The men's singles' rules have undergone several changes since the first edition. From 1884 to 1911, the event started with a knockout phase, the All-Comers singles, whose winner faced the defending champion in a challenge round. The All-Comers winner was awarded the title six times (1888, 1893, 1898, 1901, 1904, 1907) in the absence of the previous year's champion. The challenge round system was abolished with the 1912 edition.<ref name=Talbert>Template:Cite book</ref> From 1908 to 1914, when the championships were held at Newport, men's singles draws had exceeded 128 players,<ref name=Talbert>Template:Cite book</ref> but when the event moved to Forest Hills in 1915 entries would be "submitted by clubs, thereby making the clubs weed out mediocre players. Furthermore, the entry fee would be set high enough to prevent cheapskates from entering just to get a seat at the tournament at a lower price and then defaulting".<ref>Forest Hills: An illustrated history, Robert Minton, 1975, J. B. Lippincott Company, p.70</ref> From 1881, all matches but the All-Comers final and the challenge round were played as the best-of-three sets, before the event switched to best-of-five for all rounds in 1886. Best-two-out-of-three-sets matches were reintroduced for early rounds in 1917, from 1943 to 1945, and from 1975 to 1978.<ref name=Talbert/> Before 1884, the winner of the next game at five-games–all took the set in every match except the All-Comers final and the challenge round, which were won by the player who had at least six games and at least two games more than his opponent. This advantage format was introduced for the final sets of early rounds in 1884, and used for all sets in all rounds from 1887 to 1969.<ref name=Talbert/> The tie-break system was introduced in 1970 for all sets, in its best-of-nine points sudden death version until 1974, and in its best-of-13 points lingering death version since 1975.<ref name=Talbert/><ref name=2008USOYearbyyear>{{#invoke:citation/CS1|citation
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The court surface changed twice, from grass (1881–1974), to Har-Tru clay (1975–1977), to DecoTurf hard courts, since 1978.<ref name=Surfaces>{{#invoke:citation/CS1|citation
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The champion receives a full-size replica of the event's trophy engraved with his name.<ref name=FedererTrophy>{{#invoke:citation/CS1|citation
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In the U.S. National Championships, Richard Sears (1881–1887), William Larned (1901–1902, 1907–1911) and Bill Tilden (1920–1925, 1929) hold the record for most titles in the men's singles, with seven victories each. Four of Sears' wins and all of Larned's, came in a time when the tournament used a challenge round format, and they won respectively only three times and twice after going through a complete draw. Sears also holds the all-time record for most consecutive titles, with seven from (1881 to 1887); the first win came when the event was closed to foreign participants. Without the challenge round, the record stands at six, and is held by Tilden (1920–1925).<ref name=2008USOFinals/>
During the US Open, since the inclusion of the professional tennis players, Jimmy Connors (1974, 1976, 1978, 1982–1983), Pete Sampras (1990, 1993, 1995–1996, 2002), and Roger Federer (2004–2008) have won the most championships, with five titles. Federer has had the most consecutive wins, with five (2004–2008).<ref name=2008USOFinals/>
Champions
United States National Championships
Richard Sears, the champion of the first seven editions of the U.S. Championships.William Larned was the second man to win seven titles at the event.Tilden won six consecutive titles and seven non-challenge round championships in total, an all-time record.
Key
USNLTA clubs members only event *
All Comers' winner, Challenge round winner ‡
Defending champion, Challenge round winner †
All Comers' winner, no Challenge round ◊
Year
Country
Champion
Country
Runner-up
Score in the final<ref name=UsoMensSingles>{{#invoke:citation/CS1|citation
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