Caroline Wozniacki faces Serena Williams in the U.S. Open final . Wozniacki wins in dramatic fashion after her opponent falls . 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 . China 's Peng Shuai had to be taken off center court in a wheelchair . World No . 1 Williams crushed Russia 's Maria Lara in an hour .
Caroline Wozniacki faces Serena Williams in the U.S. Open final . Wozniacki wins in dramatic fashion after her opponent falls . China 's Peng Shuai had to be taken off center court in a wheelchair . World No . 1 Williams crushed Russia 's Maria Lara in an hour .