Switzerland's Stanislas Wawrinka serves during the the quarter final tennis match against Serbia's Novak Djokovic at the Swiss Indoors tournament on November 6, 2009 in Basel. Djokovic won the match 3-6, 7-6 (7-5), 6-2. AFP PHOTO / SEBASTIAN DERUNGS (Photo credit should read SEBASTIAN DERUNGS/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a forehand return against Radek Stepanek of Czech Republic during their third round match at the ATP Masters tennis tournament in Shanghai on October 15, 2009. Stepanek won the match 3-6, 7-6 (7/5), 4-2 after Wawrinka retired in the third set due to injury. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a backhand return against Radek Stepanek of Czech Republic during their third round match at the ATP Masters tennis tournament in Shanghai on October 15, 2009. Stepanek won the match 3-6, 7-6 (7/5), 4-2 after Wawrinka retired in the third set due to injury. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a return against US tennis player Andy Roddick during their first round match at the ATP Shanghai Masters tennis tournament in Shanghai on October 13, 2009. Wawrinka won by retirement. AFP PHOTO / PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a return against US tennis player Andy Roddick during their first round match at the ATP Shanghai Masters tennis tournament in Shanghai on October 13, 2009. Wawrinka won by retirement. AFP PHOTO / PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a return against US tennis player Andy Roddick during their first round match at the ATP Shanghai Masters tennis tournament in Shanghai on October 13, 2009. Wawrinka won by retirement. AFP PHOTO / PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a return against US tennis player Andy Roddick during their first round match at the ATP Shanghai Masters tennis tournament in Shanghai on October 13, 2009. Wawrinka won by retirement. AFP PHOTO / PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

Stanislas Wawrinka of Switzerland returns the ball to Gael Monfils of France during a quarter-final match of the Japan Open tennis tournament in Tokyo on October 9, 2009. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

Stanislas Wawrinka of Switzerland stretches for the ball from Gael Monfils of France during a quarter-final match of the Japan Open tennis tournament in Tokyo on October 9, 2009. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

Stanislas Wawrinka of Switzerland smashes the ball to Gael Monfils of France during a quarter-final match of the Japan Open tennis tournament in Tokyo on October 9, 2009. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

Stanislas Wawrinka of Switzerland returns the ball against Simon Greul of Germany during the second round match in the Japan Open tennis tournament in Tokyo on October 7, 2009. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

Stanislas Wawrinka of Switzerland reacts after getting a point against Simon Greul of Germany during the second round match in the Japan Open tennis tournament in Tokyo on October 7, 2009. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

Stanislas Wawrinka of Switzerland returns the ball against Simon Greul of Germany during the second round match in the Japan Open tennis tournament in Tokyo on October 7, 2009. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)

Stanislas Wawrinka of Switzerland hits a return against John Isner of the US during their men's singles first round match in the Japan Open tennis tournament in Tokyo on October 5, 2009. Wawrinka won the match 6-4, 6-4. AFP PHOTO/Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland returns a shot during his match against John Isner of the USA during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Koichi Kamoshida/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland returns a shot during his match against John Isner of the USA during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Koichi Kamoshida/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland plays a backhand in his match against John Isner of the US during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Junko Kimura/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland returns a shot during his match against John Isner of the USA during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Koichi Kamoshida/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland plays a backhand in his match against John Isner of the US during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Junko Kimura/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland returns a shot during his match against John Isner of the USA during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Koichi Kamoshida/Getty Images)

TOKYO - OCTOBER 05: Stanislas Wawrinka of Switzerland plays a backhand in his match against John Isner of the US during day one of the Rakuten Open Tennis tournament at Ariake Colosseum on October 5, 2009 in Tokyo, Japan. (Photo by Junko Kimura/Getty Images)

Stanislas Wawrinka of Switzerland hits the ball against John Isner of the US during their men's singles first round match in the Japan Open tennis tournament in Tokyo on October 5, 2009. AFP PHOTO/Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

Stanislas Wawrinka of Switzerland reaches for a return against John Isner of the US during their men's singles first round match in the Japan Open tennis tournament in Tokyo on October 5, 2009. AFP PHOTO/Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)