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MELBOURNE, AUSTRALIA - JANUARY 26: Venus Williams of the United States serves in her semifinal match against CoCo Vandeweghe of the United States on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Venus Williams of the United States serves in her semifinal match against CoCo Vandeweghe of the United States on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)