Peng , who underwent heart surgery as a young junior , had to lean against the backboard on center court for support when she was first overcome by the pain while holding a break point in the final game of the match . Caroline Wozniacki faces Serena Williams in the U.S. Open final . Caroline Wozniacki advances in dramatic fashion after her opponent retired . China 's Peng Shuai had to be taken off center court in a wheelchair . World No . two Peng Shuai crushed U.S. 's Wozniacki in an hour .
Caroline Wozniacki faces Serena Williams in the U.S. Open final . Caroline Wozniacki advances in dramatic fashion after her opponent retired . China 's Peng Shuai had to be taken off center court in a wheelchair . World No . two Peng Shuai crushed U.S. 's Wozniacki in an hour .