Each day of the US Open, Anita Aguilar will share the best photo of the day.

Photo of the Day:
Kerber becomes
No. 1

Photo of the Day: Kerber becomes No. 1

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On Friday, Angelique Kerber beat Caroline Wozniacki in straight sets to reach the final, becoming No. 1 since Serena Williams fell to Karolina Pliskova earlier in the day.