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LONDON, ENGLAND - JULY 06: Denis Kudla of the United States plays a backhand in his Gentlemen's Singles Fourth Round match against Marin Cilic of Croatia during day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 06:  Denis Kudla of the United States plays a backhand in his Gentlemen's Singles Fourth Round match against Marin Cilic of Croatia during day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2015 in London, England.  (Photo by Clive Brunskill/Getty Images)