Coco Gauff’s ongoing issues with her serve were back in the spotlight after a three-set loss to Jessica Pegula at the WTA Finals.

The American hit 17 double faults and finished the match with 75 unforced errors in her 3-6, 7-6, 2-6 defeat to Pegula.

She had worked with biomechanics coach Gavin MacMillan, who previously helped Aryna Sabalenka address similar problems. Gauff appeared to be making progress, as she hadn’t recorded double-digit double faults in a match since the US Open.

Gauff appeared to have steadied things for a while and hadn’t reached double-digit double faults in any match since the US Open.

Photo by Robert Prange/Getty Images

However, her performance against Pegula has raised fresh concerns about whether those improvements will last. Even so, American tennis coach R

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