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MELBOURNE, AUSTRALIA - JANUARY 19: Denisa Allertova of Czech Republic plays a backhand in her first round match against Bethanie Mattek-Sands of the United States during day two of the 2016 Australian Open at Melbourne Park on January 19, 2016 in Melbourne, Australia. (Photo by Zak Kaczmarek/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 19:  Denisa Allertova of Czech Republic plays a backhand in her first round match against Bethanie Mattek-Sands of the United States during day two of the 2016 Australian Open at Melbourne Park on January 19, 2016 in Melbourne, Australia.  (Photo by Zak Kaczmarek/Getty Images)