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MELBOURNE, AUSTRALIA - FEBRUARY 03: Serena Williams of the United States serves against Tsvetana Pironkova of Bulgaria during day four of the WTA 500 Yarra Valley Classic at Melbourne Park on February 03, 2021 in Melbourne, Australia. (Photo by TPN/Getty Images)

MELBOURNE, AUSTRALIA - FEBRUARY 03: Serena Williams of the United States serves against Tsvetana Pironkova of Bulgaria during day four of the WTA 500 Yarra Valley Classic at Melbourne Park on February 03, 2021 in Melbourne, Australia. (Photo by TPN/Getty Images)
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