The 2009 US Open tennis championships

A rain-soaked US Open 2009 held a few big surprises for tennis fans. Serena Williams' bizarre, expletive-laden ejection after a terrible call gave the semifinal to Kim Clijsters, although Clijsters appeared headed for victory anyway. Clijsters became the first unseeded woman to win the US Open, coming out of a two-year retirement. She's also the first mom to win since 1980. Juan Martin Del Potro needed no help from officials to upset Roger Federer in the men's final, ending Federer's streak of five US Open championships. Del Potro was appearing in his first majors final, while Federer has played in 16 of the last 17 Grand Slam finals. ( 26 photos total)

Kim Clijsters battles Caroline Wozniacki during the women's final US Open match at the USTA Billie Jean King National Tennis Center September 13 in New York. (TIMOTHY A. CLARY/AFP/Getty Images)

The sun sets over Arthur Ashe Stadium as Maria Sharapova takes on Tsvetana Pironkova September 1. (Julian Finney/Getty Images) #

Marc Gicquel serves to Dmitry Tursunov August 31. (Al Bello/Getty Images) #

Fans wait for autographs after the match between Tomas Berdych and Wayne Odesnik September 1. (REUTERS/Mike Segar) #

Sisters golden hair: (clockwise from left) Viktoriya Kutuzova, Caroline Wozniacki, Magdalena Rybarikova, and Maria Sharapova. (TIMOTHY A. CLARY/AFP/Getty Images) (TIMOTHY A. CLARY/AFP/Getty Images) (AP Photo/Darron Cummings) (TIMOTHY A. CLARY/AFP/Getty Images) #

Fancy footwork: Andy Murray (left) and Gael Monfils put the practice courts to good use. (AP Photo/Kathy Willens) (REUTERS/Shaun Best) #

Bjorn Phau falls as he makes a return to Andy Roddick August 31. (REUTERS/Jeff Zelevansky) #

Robert Kendrick returns a shot against Tommy Haas September. (Nick Laham/Getty Images) #

Jo-Wilfried Tsonga dives for a shot against Julien Benneteau September 6. (Chris McGrath/Getty Images) #

Anastasia Rodionova returns to Kateryna Bondarenko September 5. (EMMANUEL DUNAND/AFP/Getty Images) #

Taylor Dent reacts to losing a game to Andy Murray September 6. (REUTERS/Jeff Zelevansky) #

Taylor Dent serves to Ivan Navarro September 4. (STAN HONDA/AFP/Getty Images) #

Andy Murray reacts during his match against Marin Cilic September 8. (TIMOTHY A. CLARY/AFP/Getty Images) #

Rafael Nadal serves to Gael Monfils September 8. (REUTERS/Shaun Best) #

Novak Djokovic wipes his forehead during his match against Fernando Verdasco September 9. (AP Photo/Amy Sancetta) #

Roger Federer peeks out of his shirt during his match against Novak Djokovic September 13. (TIMOTHY A. CLARY/AFP/Getty Images) #

Venus Williams (left) confers with her sister Serena during their doubles match against Alisa Kleybanova and Ekaterina Makarova September 10. (AP Photo/Charles Krupa) #

Technicians tend to the rain-soaked court September 11. (Julian Finney/Getty Images) #

Spectators wait out the rain delay September 11. (Jim McIsaac/Getty Images) #

Caroline Wozniacki hits a return to Yanina Wickmayer September 12. (REUTERS/David Gray) #

Lukas Dlouhy (left) and Leander Paes celebrate after winning the men's doubles final over Mahesh Bhupathi and Mark Knowles September 13. (STAN HONDA/AFP/Getty Images) #

Novak Djokovic returns a shot to Roger Federer September 13. (Nick Laham/Getty Images) #

An airliner flies over as Lukas Dlouhy and Leander Paes (left) play against Mahesh Bhupathi and Mark Knowles during the men's doubles final September 13. (Mario Tama/Getty Images) #

Kim Clijsters kisses the championship trophy after defeating Caroline Wozniacki in the women�s singles final September 13. (Matthew Stockman/Getty Images) #

Juan Martin Del Potro of Argentina celebrates after defeating Roger Federer in the men's singles final September 14. (Jared Wickerham/Getty Images) #

Marcelo Gomez (center), who coached Juan Martin del Potro since he was a child until 2007, is carried by friends in his hometown of Tandil, Argentina as they celebrate Del Potro's victory against Roger Federer in the men's singles final September 14. (REUTERS/Marcos Brindicci) #

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The 2009 US Open tennis championships