Jack Draper might have been defeated by Jannik Sinner in the US Open semi-final but he went down fighting every point. The 22-year-old, who threw up on court three times, was exhausted throughout the contest as the world No. 1 triumphed 7-5 7-6 (7-3) 6-2. But despite losing in straight sets, it does not paint the gruelling battle that both tennis stars endured on a muggy afternoon at Flushing Meadows. Both were put through the wringer and needed medical assistance as some games stretched on as long as 30 minutes before either were allowed to sit down. Ultimately, Sinner simply had too much for…