WTA semis: Williams-Wozniacki, Halep-Radwanska (Yahoo Sports)

Serena Williams made the semifinals of the WTA Finals and earned the year-end No. 1 ranking without hitting a ball on Friday. Williams’ fortune was at the expense of Ana Ivanovic and Maria Sharapova. Ivanovic had a shot at reaching the semis, and Sharapova had a slimmer chance at the top ranking. By the end of the final day of group games, Saturday’s semifinals were set: Williams will meet Caroline Wozniacki, and Simona Halep will take on Agnieszka Radwanska.