Serena Williams at No. 1, despite not playing since January

Serena Williams is briefly back at No. 1 in the WTA rankings, despite not playing a match since January. She also plans to take the rest of 2017 off because she is expecting a baby.

Thanks to a calendar quirk, Williams moved up one spot Monday from No. 2, swapping places with Angelique Kerber.

The return to No. 1 , which gives the 35-year-old American her 317th week there, comes less than a week after Williams let the world know via Snapchat that she is pregnant. The baby is due in the fall, and spokeswoman Kelly Bush Novak says Williams will take the rest of this season off and intends to return to the tour next year.

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