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LONDON, ENGLAND - JULY 04: Alexander Bublik of Russia in action during the Boys Singles First Round match against Stefanos Tsitsipas of Greece during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)

LONDON, ENGLAND - JULY 04:  Alexander Bublik of Russia in action during the Boys Singles First Round match against Stefanos Tsitsipas of Greece during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England.  (Photo by Shaun Botterill/Getty Images)