Andy Roddick of the US returns the ball to Novak Djokovic of Serbia in their men’s singles tennis match on day 9 of the Australian Open in Melbourne on January 27, 2009. Roddick powered into the Australian Open semi-finals when defending champion Novak Djokovic pulled out with illness trailing 7-6 (7/3), 4-6, 2-6, 1-2. AFP PHOTO / GREG WOOD (Photo credit should read GREG WOOD/AFP/Getty Images)

Andy Roddick of the US celebrates after winning a point during his men’s singles match against Tommy Robredo of Spain at the Australian Open tennis tournament in Melbourne on January 25, 2009. Roddick won 7-5, 6-1, 6-3. .AFP PHOTO/William WEST (Photo credit should read WILLIAM WEST/AFP/Getty Images)

Andy Roddick of the US celebrates on his way to defeating Fabrice Santoro of France during their men’s singles tennis match on the fifth day of the Australian Open in Melbourne on January 23, 2009. Roddick powered past outgunned French veteran Fabrice Santoro 6-3, 6-4, 6-2 to move into the fourth round of the Australian Open. The crafty Santoro was playing his 66th Grand Slam, a record for tennis in the Open area, and was presented with a bottle of champagne by tournament director Craig Tiley after the match to mark the occasion. He confirmed that it was his last singles appearance at Melbourne Park after a remarkable 17-year run stretching back to 1991. AFP PHOTO / PAUL CROCK (Photo credit should read PAUL CROCK/AFP/Getty Images)

Andy Roddick of the US takes a breath in his game against Xavier Malisse of Belgium during their men’s singles match on the third day of the Australian Open in Melbourne on January 21, 2009. Malisse leads 6-4, 2-5 as play continues. AFP PHOTO / GREG WOOD (Photo credit should read GREG WOOD/AFP/Getty Images)