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LONDON, ENGLAND - JULY 02: Grigor Dimitrov of Bulgaria appears dejected after being defeated by Stanislas Wawrinka of Switzerland during their Men's Singles first round match on day one of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 2, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 02:  Grigor Dimitrov of Bulgaria appears dejected after being defeated by Stanislas Wawrinka of Switzerland during their Men's Singles first round match on day one of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 2, 2018 in London, England.  (Photo by Clive Brunskill/Getty Images)