Coco Gauff’s serve, once considered one of the most potent weapons in her arsenal, has lately become a major cause of concern for her. Of late, she has struggled with consistency, committing an alarming number of double faults. Last year, she committed 430 double faults in her 71 matches. This year, she has played 44 matches and has committed more than 250 double faults already—42 of them came in just the three singles matches she played in the Canadian Open.

She committed 23 double faults in her opening match against Danielle Collins—the fifth-highest number ever recorded in a WTA Tour match. Last year, when her service struggles cost her the US Open fourth round against Emma Navarro, Rennae Stubbs couldn’t help but flag what she thought were obvious gaps in her technique during an ESPN

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