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Czech Republic's Petra Kvitova reacts after a point against Danielle Collins of the US during their women's singles semi-final match on day 11 of the Australian Open tennis tournament in Melbourne on January 24, 2019. (Photo by DAVID GRAY / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE -- (Photo credit should read DAVID GRAY/AFP/Getty Images)

Czech Republic's Petra Kvitova reacts after a point against Danielle Collins of the US during their women's singles semi-final match on day 11 of the Australian Open tennis tournament in Melbourne on January 24, 2019. (Photo by DAVID GRAY / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE --        (Photo credit should read DAVID GRAY/AFP/Getty Images)