INDIAN WELLS, Calif. (AP) Serena Williams beat defending champion Simona Halep 6-4, 6-3, punctuating the victory with her seventh ace. Halep has lost to Williams six of the seven times they've played and the Romanian has yet to successfully defend a title in her career. Halep had nine winners to 28 for Williams.

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Williams advanced to the semifinals, where she will play Agnieszka Radwanska, who defeated Petra Kvitova 6-2, 7-6 (3). Radwanska will move up to No. 2 behind Williams in next week's WTA Tour rankings based on making the semis.

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''It's unfortunate it can't be a final,'' Williams said.