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 returns the ball to 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)