US Serena Williams reacts during the final of the WTA Rome Masters against Belarus' Viktoryja Azaranka on May 19, 2013. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE,FILIPPO MONTEFORTE/AFP/Getty Images)
US Serena Williams returns a ball to Belarus' Viktoryja Azaranka during the final of the WTA Rome Masters on May 19, 2013. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE,FILIPPO MONTEFORTE/AFP/Getty Images)
US Serena Williams serves a ball to Belarus' Viktoryja Azaranka during the final of the WTA Rome Masters on May 19, 2013. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS,GABRIEL BOUYS/AFP/Getty Images)
US Serena Williams serves a ball to Belarus' Viktoryja Azaranka during the final of the WTA Rome Masters on May 19, 2013. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS,GABRIEL BOUYS/AFP/Getty Images)
US Serena Williams reacts during the final of the WTA Rome Masters against Belarus' Viktoryja Azaranka on May 19, 2013. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE,FILIPPO MONTEFORTE/AFP/Getty Images)