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Belgium's Elise Mertens returns to Slovakia's Dominika Cibulkova in their women's singles third round match on the sixth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 7, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Belgium's Elise Mertens returns to Slovakia's Dominika Cibulkova in their women's singles third round match on the sixth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 7, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) / RESTRICTED TO EDITORIAL USE        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)