FILE - In this May 29, 2018, file photo, Serena Williams returns a shot against Krystyna Pliskova during their first-round match of the French Open tennis tournament in Paris, France. The women's tennis tour has approved rule changes that involve seedings after a return from pregnancy. Former No. 1 players Williams and Victoria Azarenka are recent mothers on the tour. (AP Photo/Michel Euler, File)
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