Question: Who beat the 2006 NASDAQ-100 Open Men's Singles winner in the U.S. Open?

full_context: Document 1: 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 2: 2008 US Open – Men's Singles: Roger Federer was the four-time defending champion, and successfully defended his title. This was Federer's 5th consecutive US Open title after winning in the final 6–2, 7–5, 6–2 against Andy Murray of Great Britain who was contesting his first major final. It was Federer's 13th Grand Slam title and his only successful title defence in majors that year, after losing the Australian Open and Wimbledon titles, now moved to second place on the all time men's singles Grand Slam wins list, passing Roy Emerson.
Document 3: 2017 Wimbledon Championships – Men's Singles: Roger Federer achieved his record eighth Wimbledon and 19th Grand Slam men's singles title, defeating Marin Čilić in the final, 6 -- 3, 6 -- 1, 6 -- 4. Federer thus became the only male player to win the Wimbledon singles title eight times, as well as only the second man in the Open era, after Björn Borg in 1976, to win Wimbledon without losing a set. This was Federer's 70th appearance at a Grand Slam, tying the record for male players and a record - breaking 11th men's singles final at the same Grand Slam tournament. In addition, by virtue of his third - round win over Mischa Zverev, Federer won his 317th Grand Slam singles match, surpassing Serena Williams' record of 316 match wins and giving him the all - time record for the most Grand Slam singles wins by any player, male or female. The tournament marked the fifth time that Nadal and Federer won the French Open and Wimbledon respectively in the same year.
Document 4: 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 5: 2006 Pacific Life Open – Men's Singles: First-seeded Roger Federer of Switzerland was the two-time defending champion, and won again, defeating James Blake in the final 7–5, 6–3, 6–0.
Document 6: 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 7: 2013 BNP Paribas Open – Men's Singles: Roger Federer was the defending champion, but lost to Rafael Nadal in the quarterfinals. Nadal went on to win the title, defeating Juan Martín del Potro in the final, 4–6, 6–3, 6–4.
Document 8: 2006 NASDAQ-100 Open – Men's Singles: Roger Federer was the defending champion and won the title again with a straight sets 7–6, 7–6, 7–6 victory over Croat sixth-seed Ivan Ljubičić.
Document 9: Roger Federer: Federer's main accomplishments as a junior player came at Wimbledon in 1998, where he won both the boys' singles final over Irakli Labadze, and in doubles teamed with Olivier Rochus, defeating the team of Michaël Llodra and Andy Ram. In addition, Federer lost the US Open Junior final in 1998 to David Nalbandian. He won four ITF junior singles tournaments in his career, including the prestigious Orange Bowl, where he defeated Guillermo Coria in the final. He ended 1998 with the No. 1 junior world ranking, was awarded ITF junior World Champion, and entered his first tournament as a professional during 1998 in Gstaad, where he lost to Lucas Arnold Ker in the first round.
Document 10: 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 11: 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 12: Roger Federer: Roger Federer Federer at Wimbledon in 2009. Country (sports) Switzerland Residence Bottmingen, Switzerland (1981 - 08 - 08) 8 August 1981 (age 36) Basel, Switzerland Height 1.85 m (6 ft 1 in) Turned pro 1998 Plays Right - handed (one - handed backhand) Prize money US $108,250,560 2nd all - time leader in earnings Official website rogerfederer.com Singles Career record 1121 -- 249 (81.82%) Career titles 93 (3rd in the Open Era) Highest ranking No. 1 (2 February 2004) Current ranking No. 2 (25 September 2017) Grand Slam Singles results Australian Open W (2004, 2006, 2007, 2010, 2017) French Open W (2009) Wimbledon W (2003, 2004, 2005, 2006, 2007, 2009, 2012, 2017) US Open W (2004, 2005, 2006, 2007, 2008) Other tournaments Tour Finals W (2003, 2004, 2006, 2007, 2010, 2011) Olympic Games F (2012) Doubles Career record 129 -- 89 (59.17%) Career titles 8 Highest ranking No. 24 (9 June 2003) Current ranking -- (25 September 2017) Grand Slam Doubles results Australian Open 3R (2003) French Open 1R (2000) Wimbledon QF (2000) US Open 3R (2002) Other doubles tournaments Olympic Games W (2008) Team competitions Davis Cup W (2014) Hopman Cup W (2001) Olympic medal record (hide) 2008 Beijing Doubles 2012 London Singles Last updated on: 25 September 2017.
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, marking the third time he broke his own all - time record, after breaking 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: 2006 NASDAQ-100 Open – Men's Singles >> winner Answer: Roger Federer
who beat Roger Federer in the us open Answer: Novak Djokovic