Question: Who beat the winner of the most men's singles titles at Wimbledon in the Open Era in the US Open?

full_context: Document 1: 2017 Australian Open – Men's singles final: The 2017 Australian Open Men's Singles final was the championship tennis match of the Men's Singles tournament at the 2017 Australian Open. It was contested between Roger Federer and Rafael Nadal, ranked 17th and 9th in the world respectively. It was their record ninth meeting in a Grand Slam final in their rivalry, and their 1st meeting in a Grand Slam final since the 2011 French Open. In a rematch of the 2009 Australian Open final, which Nadal won in 5 sets, Roger Federer won the duel in 5 sets, beating Nadal for the first time in a Grand Slam since the 2007 Wimbledon final. He also trailed Nadal 3 -- 1 in the final set but won 5 games in a row to win the title. This ended a 6 - match losing streak against Nadal in Grand Slam events. Having lost all of their previous three encounters, this was the first time Federer defeated Nadal at the Australian Open and also marked Federer's first Grand Slam victory over Nadal outside the grass courts of Wimbledon. Federer extended his record of Grand Slam men's singles titles to 18, marking the third time he broke his own all - time record, after breaking the previous record of 14, held by Pete Sampras.
Document 2: Djokovic–Federer rivalry: The Djokovic -- Federer rivalry is a tennis rivalry between two professional tennis players, Novak Djokovic and Roger Federer. They have faced each other 45 times with Djokovic leading 23 -- 22. This includes a record 15 Grand Slam matches, four of which were finals, plus a record ten semifinals. Both players have beaten the other in each of the four Grand Slam tournaments. Federer dominated during their early slam matches, but Djokovic now has a 9 -- 6 lead in Grand Slam matches, including eight wins in the last ten meetings. A notable aspect of the rivalry is their ability to beat each other on any given day, including Grand Slam play, making it one of the most competitive and evenly matched rivalries in the Open Era. To date Federer is the only man to have beaten Djokovic in all four majors, and likewise Djokovic is the only man to have beaten Federer in all four majors. Both men accomplished this after having beaten each other at Wimbledon. Both players are generally considered to be the two greatest hard court players in the open era.
Document 3: Novak Djokovic: Djokovic is widely regarded as one of the greatest tennis players of all time. He has won 13 Grand Slam singles titles, five ATP Finals titles, 30 Masters 1000 series titles, 12 ATP World Tour 500 tournaments, and has held the No. 1 spot in the ATP rankings for a total of 223 weeks. In majors, he has won six Australian Open titles, four Wimbledon titles, two US Open titles and one French Open title. In 2016, he became the eighth player in history to achieve the Career Grand Slam. Following his victory at the 2016 French Open, he became the third man to hold all four major titles at once, the first since Rod Laver in 1969, and the first ever to do so on three different surfaces.
Document 4: List of Wimbledon gentlemen's singles champions: Player Open Era Amateur Era All - time Years Federer, Roger Roger Federer (SUI) 8 0 8 2003, 2004, 2005, 2006, 2007, 2009, 2012, 2017 Renshaw, William William Renshaw (BRI) 0 7 7 1881, 1882, 1883, 1884, 1885, 1886, 1889 Sampras, Pete Pete Sampras (USA) 7 0 7 1993, 1994, 1995, 1997, 1998, 1999, 2000 Doherty, Laurence Laurence Doherty (BRI) 0 5 5 1902, 1903, 1904, 1905, 1906 Borg, Björn Björn Borg (SWE) 5 0 5 1976, 1977, 1978, 1979, 1980 Doherty, Reginald Reginald Doherty (BRI) 0 1897, 1898, 1899, 1900 Wilding, Anthony Anthony Wilding (NZL) 0 1910, 1911, 1912, 1913 Laver, Rod Rod Laver (AUS) 1961, 1962, 1968, 1969 Baddeley, Wilfred Wilfred Baddeley (BRI) 0 1891, 1892, 1895 Gore, Arthur Arthur Gore (BRI) 0 1901, 1908, 1909 Tilden, Bill Bill Tilden (USA) 0 1920, 1921, 1930 Perry, Fred Fred Perry (GBR) 0 1934, 1935, 1936 Newcombe, John John Newcombe (AUS) 1967, 1970, 1971 McEnroe, John John McEnroe (USA) 0 1981, 1983, 1984 Becker, Boris Boris Becker (GER) 0 1985, 1986, 1989 Djokovic, Novak Novak Djokovic (SRB) 0 2011, 2014, 2015 Hartley, John John Hartley (BRI) 0 1879, 1880 Pim, Joshua Joshua Pim (BRI) 0 1893, 1894 Brookes, Norman Norman Brookes (AUS) 0 1907, 1914 Patterson, Gerald Gerald Patterson (AUS) 0 1919, 1922 Borotra, Jean Jean Borotra (FRA) 0 1924, 1926 Lacoste, René René Lacoste (FRA) 0 1925, 1928 Cochet, Henri Henri Cochet (FRA) 0 1927, 1929 Budge, Don Don Budge (USA) 0 1937, 1938 Hoad, Lew Lew Hoad (AUS) 0 1956, 1957 Emerson, Roy Roy Emerson (AUS) 0 1964, 1965 Connors, Jimmy Jimmy Connors (USA) 0 1974, 1982 Edberg, Stefan Stefan Edberg (SWE) 0 1988, 1990 Nadal, Rafael Rafael Nadal (ESP) 0 2008, 2010 Murray, Andy Andy Murray (GBR) 0 2013, 2016
Document 5: List of Wimbledon gentlemen's singles champions: In the Open Era, since the inclusion of professional tennis players in 1968, Roger Federer (2003 -- 2007, 2009, 2012, 2017) holds the record for the most Gentlemen's Singles titles with eight. Björn Borg (1976 -- 1980) and Roger Federer (2003 -- 2007) share the record for most consecutive victories with five.
Document 6: Roger Federer career statistics: Federer has won the most grand slam tournament titles for a male player (19). He has reached the most finals (29), semifinals (42) and quarterfinals (51). He has participated in the highest number of majors (71), and the most consecutively (65). He has won the most matches at these tournaments (325). He is the only man to reach each final at least five times. He is the only man to win three tournaments five times each. He is the only man to win two of these tournaments five times consecutively. He is one of eight men to win all four majors.
Document 7: List of Wimbledon gentlemen's singles champions: In the Open Era, since the inclusion of professional tennis players in 1968, Roger Federer (2003 -- 2007, 2009, 2012, 2017) holds the record for most victories in the Gentlemen's Singles Final with eight. Björn Borg (1976 -- 1980) and Roger Federer (2003 -- 2007) co-hold the record for most consecutive victories with five.
Document 8: List of Grand Slam men's singles champions: Rank Player Total Years Australian Open French Open Wimbledon US Open Roger Federer 20 2003 -- 2018 6 8 5 Rafael Nadal 17 2005 -- 2018 11 Pete Sampras 14 1990 -- 2002 0 7 5 Novak Djokovic 13 2008 -- 2018 6 5 Roy Emerson 12 1961 -- 1967 6 6 Rod Laver 11 1960 -- 1969 Björn Borg 11 1974 -- 1981 0 6 5 0 8 Bill Tilden 10 1920 -- 1930 0 0 7 9 Fred Perry 8 1933 -- 1936 Ken Rosewall 8 1953 -- 1972 0 Jimmy Connors 8 1974 -- 1983 0 5 Ivan Lendl 8 1984 -- 1990 0 Andre Agassi 8 1992 -- 2003 14 Richard Sears 7 1881 -- 1887 0 0 0 7 William Renshaw 7 1881 -- 1889 0 0 7 0 William Larned 7 1901 -- 1911 0 0 0 7 René Lacoste 7 1925 -- 1929 0 Henri Cochet 7 1926 -- 1932 0 John Newcombe 7 1967 -- 1975 0 John McEnroe 7 1979 -- 1984 0 0 Mats Wilander 7 1982 -- 1988 0 22 Laurence Doherty 6 1902 -- 1906 0 0 5 Tony Wilding 6 1906 -- 1913 0 0 Jack Crawford 6 1931 -- 1935 0 Don Budge 6 1937 -- 1938 Stefan Edberg 6 1985 -- 1992 0 Boris Becker 6 1985 -- 1996 0 28 Frank Sedgman 5 1949 -- 1952 0 Tony Trabert 5 1953 -- 1955 0
Document 9: List of Wimbledon gentlemen's singles champions: Wimbledon Gentlemen's Singles Champions Location London United Kingdom Venue AELTC Governing body AELTC Created 1877 (established) Editions Tournaments staged: (132 editions) Open Era: 1968 (50 editions) Surface Grass (1877 -- present) Prize money £2,200,000 (2017) Trophy Gentleman's Singles Trophy Website wimbledon.com Most titles Amateur era 7: William Renshaw (challenge round) 3: Fred Perry (regular) Open era 8: Roger Federer Most consecutive titles Amateur era 6: William Renshaw (challenge round) 3: Fred Perry (regular) Open era 5: Björn Borg 5: Roger Federer Current champion Novak Djokovic (Fourth title)
Document 10: List of Wimbledon gentlemen's singles champions: Wimbledon Gentlemen's Singles Champions Location London United Kingdom Venue AELTC Governing body AELTC Created 1877 (established) Open Era: 1968 (49 editions) Surface Grass (1877 -- Present) Prize money £2,200,000 (2017) Trophy Wimbledon Cup Website wimbledon.com Most titles Amateur era 7: William Renshaw (challenge round) 3: Fred Perry (regular) Open era 8: Roger Federer Most consecutive titles Amateur era 6: William Renshaw (challenge round) 3: Fred Perry (regular) Open era 5: Björn Borg Roger Federer Current champion Roger Federer (Eighth title)
Document 11: List of Grand Slam men's singles champions: Rank Player Total Winning Span Australian Open French Open Wimbledon US Open Roger Federer 19 15 5 8 5 Rafael Nadal 16 13 10 Pete Sampras 14 13 0 7 5 Roy Emerson 12 7 6 Novak Djokovic 12 9 6 6 Rod Laver 11 10 Björn Borg 11 8 0 6 5 0 8 Bill Tilden 10 11 0 0 7 9 Fred Perry 8 Ken Rosewall 8 20 0 Jimmy Connors 8 10 0 5 Ivan Lendl 8 7 0 Andre Agassi 8 12 14 Richard Sears 7 7 0 0 0 7 William Renshaw 7 9 0 0 7 0 William Larned 7 11 0 0 0 7 René Lacoste 7 5 0 Henri Cochet 7 7 0 John Newcombe 7 9 0 John McEnroe 7 6 0 0 Mats Wilander 7 7 0 22 Laurence Doherty 6 5 0 0 5 Tony Wilding 6 8 0 0 Jack Crawford 6 5 0 Don Budge 6 Stefan Edberg 6 8 0 Boris Becker 6 12 0 28 Frank Sedgman 5 0 Tony Trabert 5 0
Document 12: List of Wimbledon gentlemen's singles champions: Wimbledon Gentlemen's Singles Champions Location London United Kingdom Venue AELTC Governing body AELTC Created 1877 (established) Editions Tournaments staged: (131 editions) Open Era: 1968 (50 editions) Surface Grass (1877 -- Present) Prize money £2,200,000 (2017) Trophy Wimbledon Cup Website wimbledon.com Most titles Amateur era 7: William Renshaw (challenge round) 3: Fred Perry (regular) Open era 8: Roger Federer Most consecutive titles Amateur era 6: William Renshaw (challenge round) 3: Fred Perry (regular) Open era 5: Björn Borg Roger Federer Current champion Roger Federer (Eighth title)
Document 13: List of Wimbledon gentlemen's singles champions: Roger Federer is the only player in history, in both the Amateur and Open Era, to reach the Wimbledon Gentlemen's Singles Final eleven times. He has won on eight occasions and lost on three. Federer also is the only player in both the Amateur and Open Era to have reached seven consecutive Wimbledon Gentleman's Singles Finals from (2003 - 2009), winning six of them, the loss coming in the epic 5 set final in 2008 to Rafael Nadal.
Document 14: 2017 Australian Open – Men's singles final: The 2017 Australian Open Men's Singles final was the championship tennis match of the Men's Singles tournament at the 2017 Australian Open. It was contested between Roger Federer and Rafael Nadal, ranked 17th and 9th in the world respectively. It was their record ninth meeting in a Grand Slam final in their rivalry, and their 1st meeting in a Grand Slam final since the 2011 French Open. In a rematch of the 2009 Australian Open final, which Nadal won in 5 sets, Roger Federer won the duel in 5 sets, beating Nadal for the first time in a Grand Slam since the 2007 Wimbledon final. He also trailed Nadal 3 -- 1 in the final set but won 5 games in a row to win the title. This ended a 6 - match losing streak against Nadal in Grand Slam events. Having lost all of their previous three encounters, this was the first time Federer defeated Nadal at the Australian Open and also marked Federer's first Grand Slam victory over Nadal outside the grass courts of Wimbledon. Federer extended his record of Grand Slam men's singles titles to 18 exceeding the previous record of 14 held by Pete Sampras.
Document 15: List of Grand Slam men's singles champions: Rank Player Total Winning Span Australian Open French Open Wimbledon US Open Roger Federer 20 16 6 8 5 Rafael Nadal 16 13 10 Pete Sampras 14 13 0 7 5 Roy Emerson 12 7 6 Novak Djokovic 12 9 6 6 Rod Laver 11 10 Björn Borg 11 8 0 6 5 0 8 Bill Tilden 10 11 0 0 7 9 Fred Perry 8 Ken Rosewall 8 20 0 Jimmy Connors 8 10 0 5 Ivan Lendl 8 7 0 Andre Agassi 8 12 14 Richard Sears 7 7 0 0 0 7 William Renshaw 7 9 0 0 7 0 William Larned 7 11 0 0 0 7 René Lacoste 7 5 0 Henri Cochet 7 7 0 John Newcombe 7 9 0 John McEnroe 7 6 0 0 Mats Wilander 7 7 0 22 Laurence Doherty 6 5 0 0 5 Tony Wilding 6 8 0 0 Jack Crawford 6 5 0 Don Budge 6 Stefan Edberg 6 8 0 Boris Becker 6 12 0 28 Frank Sedgman 5 0 Tony Trabert 5 0
ground_truth: Novak Djokovic
sub_queries: who has won the most men's singles titles at wimbledon in the open era Answer: Roger Federer
who beat Roger Federer in the us open Answer: Novak Djokovic