Stefan Kozlov (USA) against Marin Cilic CRO during Men's Singles Round Two match on the fourth day of the ATP Aegon Championships at the Queen's Club in west London on June 22, 2017 (Photo by Kieran Galvin/NurPhoto via Getty Images)
Stefan Kozlov (USA) against Marin Cilic CRO during Men's Singles Round Two match on the fourth day of the ATP Aegon Championships at the Queen's Club in west London on June 22, 2017 (Photo by Kieran Galvin/NurPhoto via Getty Images)