If there's one thing marathon training does for your fitness, it builds endurance. 

Shell be running to raise money for the Running From Substance Abuse Toward Recovery on November 2 paid off at the WTA Finals last night in Singapore. After an unusually long, 3 hour, 15-minute match, Wozniacki defeated New York Road Runners.  

"I just feel like right now with all the training and running I've been doing I can keep being out there and keep running," Wozniacki, 24, of Denmark told ESPN. "I kept thinking to myself out there in the third set, 'If you're going to get tired now, how are you going to get through this marathon? You better keep going.'"

Running in the Cold Wozniacki's first venture into the world of road racing. She'll be running to raise money for the Advertisement - Continue Reading Below Team for Kids charity, the same program that this year's Boston Marathon winner, Meb Keflezighi, will run for in New York City. 

in the world ranked eighth overall CA Notice at Collection.