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LONDON, ENGLAND - JUNE 17: Steve Johnson of The USA hits a backhand during his quarter final match against Marin Cilic of Croatia during day five of The Aegon Championships at The Queens Club on June 17, 2016 in London, England. (Photo by Richard Heathcote/Getty Images)

LONDON, ENGLAND - JUNE 17:  Steve Johnson of The USA hits a backhand during his quarter final match against Marin Cilic of Croatia during day five of The Aegon Championships at The Queens Club on June 17, 2016 in London, England.  (Photo by Richard Heathcote/Getty Images)