Rather than take an immediate break after losing to Serena Williams at the WTA Finals on Saturday, Wozniacki is already looking ahead to another sporting challenge -- her first marathon. The Dane has been pounding the streets for months to prepare herself for the ultimate test of endurance, which she will undertake at the New York marathon on Nov. 2. Then head to New York very soon." Wozniacki only decided to enter the New York marathon in July, just two months after splitting with her fiance, Northern Irish golfer Rory McIlroy. Wozniacki had already sent out the invitations for the November wedding when McIlroy phoned her to say it was all off, a call that she later said left her "shocked." In the months since their break-up, Wozniacki has devoted herself to training and her tennis career has taken off again. More...