Heading into the final tennis major of the year at the U.S. Open, questions loom around the No. 1 men's player in the world. Jannik Sinner was humming along through the summer hard court season after his Wimbledon title back in July before disaster struck in the final of the Cincinnati Masters 1000.

Playing against Carlos Alcaraz in the final of a fourth consecutive tournament, Sinner wasn't his usual self in Monday's showpiece . His serve was unusually ineffective, he missed more returns than normal and his usually standout rally tolerance was nowhere to be found. Alcaraz came out blazing, clearly seeking revenge from his loss at Wimbledon, and jumped out to a quick 5-0 lead over the hampered Italian.

Sinner called the doctor at the changeover, but was clearly unfit to continue an

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