Coco Gauff stepped onto Arthur Ashe Stadium and delivered a statement. The fourth-seeded American defeated Turkey’s Zeynep Sonmez 6-3, 6-4 in the first round of the 2026 US Open, showcasing a serve that once threatened to define her struggles. Twelve months earlier the same shot had been a source of visible frustration. On Tuesday night it looked like a genuine weapon.
Gauff, the 2023 US Open champion and 2025 French Open winner, arrived in New York in strong form after capturing the Cincinnati title. The opening match offered the first real test of whether her technical adjustments would hold under Grand Slam pressure. They did.
From Serving Yips to Confidence
Last year at Flushing Meadows the image of Gauff practising serves in the rain became symbolic of her difficulties. Double faults piled up. The toss was inconsistent. Confidence drained. The serve that should have been a foundation instead became a liability that opponents could exploit.
The turnaround began with the addition of biomechanics specialist Gavin MacMillan to her team. The same coach who previously helped Aryna Sabalenka rebuild her delivery worked with Gauff on fundamental changes. Greater consistency in the ball toss, avoiding throwing it too far forward, and keeping the wrist straighter were among the key technical points. The results have been measurable across the season.
Gauff still records double faults, yet the clusters of errors that once derailed matches have largely disappeared. First-serve points won have risen. Second-serve effectiveness has improved. More importantly, her mindset has shifted. Where she once hoped the ball would simply land in, she now looks to dictate with the serve.
A Controlled and Assured Performance
Against Sonmez the difference was immediately apparent. Gauff opened with a love hold and set an aggressive tone. She reached speeds of 125 mph and finished with multiple aces. The first set was secured with relative comfort as the Turkish player struggled to neutralise the pace and placement of the opening shot.
Sonmez raised her level in the second set. She broke back and briefly led, using heavy groundstrokes and occasional net approaches. Gauff responded without panic. A lengthy service game at 2-3, in which she saved break points, proved pivotal. Once she held for 3-3, she broke again and closed out the match with authority.
The American later described the hold as “real important.” It demonstrated the mental resilience that has accompanied the technical work. She could absorb pressure on serve and still find free points or force weak returns.
Looking Ahead with Momentum
Gauff has spoken openly about the contrast with the previous year. “Now it’s like I can look back a year on and think, ‘Oh, wow, it’s a big difference,’” she said. The serve is no longer the primary talking point before matches. Opponents must now prepare for a more complete player who can win free points and control rallies from the first shot.
Her movement and defensive skills remain elite. The ability to turn defence into offence continues to frustrate rivals. With the serve functioning as a reliable platform rather than a liability, the overall package looks more dangerous. Recent results, including the Cincinnati triumph over Jessica Pegula, support that view.
The US Open holds special significance for Gauff. She claimed her first major title here in 2023. Returning as a more mature and technically refined player, she carries realistic ambitions of a deep run. The first hurdle has been cleared in straight sets, and the serve that once caused sleepless nights now provides a foundation for belief.
A Flaw Transformed
Tennis careers are often shaped by the ability to address weaknesses. Gauff’s willingness to overhaul a fundamental shot under public scrutiny speaks to her professionalism. The process was not instantaneous. Early tournaments after the changes still showed residual inconsistency. Persistence has brought clearer rewards.
On a warm New York evening the former champion looked settled and purposeful. The crowd responded to the clean ball-striking and the renewed authority on serve. For Gauff the evening was about more than one win. It was confirmation that the long hours of technical work have taken hold at the most important moment of the season.
The flaw that once dominated headlines has been largely set aside. In its place stands a more complete and confident player ready to chase another major title on the courts where her Grand Slam journey first peaked. The opening victory over Sonmez offered an encouraging glimpse of what that pursuit might look like.
