Mischa Zverev of Germany receives treatment from a trainer during his match against Fernando Gonzalez of Spain at the Shanghai ATP Masters in Shanghai on October 12, 2009. Gonzalez won the match after winning the first set 7-5, with Zverev winning the second set 7-6 (7/0) and then retiring due to injury in the third set at 2-2. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)