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LONDON, ENGLAND - JUNE 23: Gilles Muller of Luxembourg in action during his victory over Sam Querrey of USA in their Men's Singles Quarter Final Match during Day 5 of the Aegon Championships 2017 at Queens Club on June 23, 2017 in London, England. (Photo by Ashley Western - CameraSport/CameraSport via Getty Images)

LONDON, ENGLAND - JUNE 23:  Gilles Muller of Luxembourg in action during his victory over Sam Querrey of USA in their Men's Singles Quarter Final Match during Day 5 of the Aegon Championships 2017 at Queens Club on June 23, 2017 in London, England. (Photo by Ashley Western - CameraSport/CameraSport via Getty Images)