Coco Gauff has already achieved incredible success at just 21 years old, winning two Grand Slam titles and reaching World No. 3 in the rankings.
Yet, despite her rapid rise, the American star is still being told that one major weakness could prevent her from claiming the top spot in women’s tennis.
The criticism came into sharper focus after her 2025 US Open round of 16 defeat to Naomi Osaka, where Jack Sock didn’t mince words.
“Honestly, it’s been a bit of a struggle,” the former American tennis star admitted. He added bluntly: “She’s got to find that serve.”
And now, perhaps most notably, former Serena Williams coach Rick Macci has weighed in. Macci, who famously worked with the 23-time Grand Slam champion during her early years, believes Gauff is destined for greatness if she fixes one crucial area of her game.
Sharing his perspective on X, Macci wrote: “Because Coco fights and can fly, she never says good bye. Her serve will become her best shot and she contend again for the number one spot. If she is reprogramed with the more compact explosive ATP FOREHAND, the Delray Dart will be number one in the land. @CocoGauff.”
A flaw Gauff is determined to fix
Serving has been a recurring challenge for Gauff, drawing comments from coaches, analysts, and even her fellow players.
Earlier this year, she parted ways with longtime coach Matt Daly and sought the expertise of biomechanics specialist Gavin MacMillan and coach Jean-Christophe Faurel, both credited with helping Aryna Sabalenka fix similar issues in her game.
“I’m not gonna waste my time playing the way I don’t wanna play,” Gauff explained when addressing the coaching change.
Her struggles have not gone unnoticed. Former doubles great Rennae Stubbs criticized the lack of progress on her serve, saying on her podcast: “But my God, like her serve, I don’t understand why now she has literally two coaches. Nothing has changed on her serve… like the ball toss is so far ahead of her on the second serve.”
The numbers tell the story. Gauff has already racked up more than 320 double faults this season, something she openly admits must change.
“I know I probably won’t be ever double fault-free, but if I could get that to 2 per cent, 3 per cent, it would make a big difference in just making these matches a lot easier,” she acknowledged.
Experts believe time is on her side
Despite the ongoing scrutiny, many in the tennis world believe Gauff‘s best days are still ahead.
Former American pro Steve Johnson recently explained on the Nothing Major Podcast how her inconsistent serve affects the rest of her game: “When a player struggles to serve consistently, as Gauff has, it places added pressure on other areas like the forehand, backhand, and movement, eventually leading to a breakdown on court.”
Still, Johnson emphasized that she has plenty of time to make the necessary adjustments. “She’s going to figure it out. She won a slam this year, she’s still three in the world-lots of time left for her,” he said.
As for Gauff herself, she has made it clear that self-improvement is part of her identity. “For me, I just wanna get better. I’m obsessed with the process of getting better,” she said before the US Open. While she admitted that obsession can sometimes feel overwhelming, she insisted it gives her clarity about her goals.
If Macci‘s prediction holds true, then addressing her serving woes may not only help Gauff solidify her status among the elite but also pave the way for her to fulfill her destiny as the world’s best player.
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