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LONDON, ENGLAND - JULY 04: Viktoriya Tomova of Bulgaria returns against Serena Williams of The United States during their Ladies' Singles second round match on day three of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 4, 2018 in London, England. (Photo by Clive Mason/Getty Images)

LONDON, ENGLAND - JULY 04:  Viktoriya Tomova of Bulgaria returns against Serena Williams of The United States during their Ladies' Singles second round match on day three of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 4, 2018 in London, England.  (Photo by Clive Mason/Getty Images)