Sinner Withdraws from Cincinnati Open as Knee Injury Raises US Open Fears Jannik Sinner's withdrawal from the Cincinnati Open due to a knee injury has sent shockwaves through the tennis world.
The 20 year old Italian, who rose to prominence with his surprise win at Wimbledon earlier this summer, has been struggling with an unspecified issue in his right knee since July.
The timing of Sinner's withdrawal is particularly concerning, coming as it does on the eve of one of the most anticipated events in the tennis calendar: the US Open.