FILE - In this Feb. 21, 2017, file photo, Angelique Kerber, of Germany, returns the ball to fellow German Mona Barthel during the Dubai Tennis Championships, in Dubai, United Arab Emirates. Kerber is back at No. 1 in the WTA rankings, reclaiming that spot from Serena Williams. Kerber moved atop the rankings Monday, March 20. That's about six months after she originally ascended to No. 1 for the first time, overtaking Williams by winning the U.S. Open. (AP Photo/Kamran Jebreili, File)
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