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TORONTO, ON - AUGUST 08: Naomi Osaka of Japan shakes hands with Iga Swiatek of Poland following a third round match on Day 6 of the Rogers Cup at Aviva Centre on August 08, 2019 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

TORONTO, ON - AUGUST 08:  Naomi Osaka of Japan shakes hands with Iga Swiatek of Poland following a third round match on Day 6 of the Rogers Cup at Aviva Centre on August 08, 2019 in Toronto, Canada.  (Photo by Vaughn Ridley/Getty Images)

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TORONTO, ON - AUGUST 07: Serena Williams of the USA walks to the chair umpire with Elise Mertens of Belgium after thier Rogers Cup Womens tournament match on August 7, 2019 at Aviva Centre in Toronto, Ontario. Williams won and advanced, 6-3, 6-3. (Photo by Jeff Chevrier/Icon Sportswire via Getty Images)

TORONTO, ON - AUGUST 07: Serena Williams of the USA walks to the chair umpire with Elise Mertens of Belgium after thier Rogers Cup Womens tournament match on August 7, 2019 at Aviva Centre in Toronto, Ontario. Williams won and advanced, 6-3, 6-3. (Photo by Jeff Chevrier/Icon Sportswire via Getty Images)