Youzhny had perhaps his best year in 2010, winning two events, making the quarterfinals at the French Open and the semifinals at the U.S. Open. but age caught up with him in 2011. The 29-year-old failed to get past the fourth round of a major or reach the finals of any tournament.
2 of 10David Silpa/Landov
The potential-filled American suffered two medical setbacks in 2011 -- elbow surgery in June and an umbilical cord infection in September. They put more dampers on a disappointing season, one in which Querrey failed to make it past the quarterfinals of any ATP event.
3 of 10Reuters
Though injuries have plagued the Argentine's career, Nalbandian had won at least one event every year from 2005 to 2010. That streak ended as Nalbandian's 2011 campaign was interrupted by a hernia and a torn hamstring.
4 of 10John G. Mabanglo/EPA
Golubev was the ATP's Most Improved Player in 2010 but lost 18 straight matches at one point in 2011. The Kazakh fell in the first round of every Slam on his way to a 6-26 record.
5 of 10Riccardo De Luca/AP
Thiemo de Bakker
The Dutchman went 3-11 on the ATP Tour, lost in the first round of the three majors he entered and finished the year playing Challengers. Back and groin injuries did not help.
6 of 10Hugo Correia/Reuters
Chardy's ranking crested at No. 31 in 2009 and has been fading since. The Frenchman won one Challenger tournament in 2011 and made one ATP semifinal. Chardy didn't make it out of the first round of an event until April.
7 of 10Imago/Zuma Press
The man who sent Andre Agassi into retirement went 3-9 in 2011, a year after winning 29 matches. Becker withdrew from the French Open and Wimbledon with an elbow injury, sitting out seven months altogether.
8 of 10Kieran Galvin/Icon SMI
Hewitt, 30, is at his lowest ranking in 13 years. He failed to make an ATP final for the second time in four years and won one total match at a Grand Slam. Foot surgery sidelined Hewitt for three months, and an ankle injury followed. He ended his season in September.
9 of 10Kena Betancur/Reuters
Gonzalez, ranked No. 11 to open 2010, missed eight months after October 2010 hip surgery and lost a ton of ranking points. The Chilean made the third round at Wimbledon but didn't win a match the rest of the year.
10 of 10Regis Duvignau/Reuters
It's been 10 years since Clement, who turns 34 in December, was at his peak ranking of No. 10. He finished the season outside the top 100 for just the second time this century.
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