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LONDON, ENGLAND - JULY 04: Laslo Djere of Serbia hits a forehand during the Boys’ Singles quarter final match against Maximillian Marterer of Germany on day ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2013 in London, England. (Photo by Dennis Grombkowski/Getty Images)

LONDON, ENGLAND - JULY 04:  Laslo Djere of Serbia hits a forehand during the Boys’ Singles quarter final match against Maximillian Marterer of Germany on day ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2013 in London, England.  (Photo by Dennis Grombkowski/Getty Images)