Carlos Alcaraz coasted into the last 16 of the US Open on Friday with a straight-sets win despite sparking fitness concerns as he received treatment for a knee issue.

Alcaraz beat Italian 32nd seed Luciano Darderi 6-2, 6-4, 6-0 and will face Frenchman Arthur Rinderknech in the next round.

The Spaniard took a medical timeout late in the second set after complaining of knee pain but won the final seven games once play resumed and said he was "not worried about it".

Alcaraz surrendered only two points on serve in the opening set but Darderi put up more of a challenge in the second, battling back from a break down before his rival summoned the trainer at 5-4.

"I'm feeling good - I just asked for him when he (Darderi) broke my serve because I felt something wasn't working great in the knee

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