Coco Gauff is playing 'no-regrets' tennis — and that makes her the most dangerous player at the 2026 US Open

From love-30 in the third game of the second set, Coco Gauff chose the solution she called “no regrets”: four straight points, no defensive shot, no look toward the coaching box. When the final serve of that game ended with a winner, the Arthur Ashe Stadium crowd nearly stood up. Gauff simply nodded. The fourth-round match at the 2026 US Open against Iva Jovic ended after 1 hour 20 minutes, 6-1, 6-4, and she moved into the quarter-finals. Before talking about numbers, context matters. Gauff arrived in New York with nine straight wins after the Cincinnati title and a 20-set winning streak. She had not dropped a set during the first week of the Grand Slam. In Rome in May, she saved match point in a match lasting more than three hours. In New York that night, she finished the match in 80 minutes. That contrast was not accidental. There are things that only appear when you sit still longer than one set. I reviewed Gauff’s last three matches, from Cincinnati to the third round at this year’s US Open. The biggest difference is not a faster serve or better movement. It is the timing of her decisions. Gauff no longer waits for opponents to miss; she forces them into defensive corners from the third or fourth shot. The man creating the difference is not on court. Gavin MacMillan, a biomechanics expert, has worked with Gauff since she rebuilt her serve last year. MacMillan’s job is not to turn her into a different player but to make the most efficient movement repeatable over long periods. That process is “gradually taking hold.” Evidence appears in deeper returns, more varied second serves, and better balance when stepping in to strike early. The data from the match is clean. Gauff hit 18 winners and 15 unforced errors. Jovic had nine winners but 30 unforced errors. The first set lasted 33 minutes and featured six straight games for Gauff. In the second set, after being broken, she broke back immediately and held from love-30 with four direct points. Numbers do not lie. We just have to ask the right questions. The right question here is: why is she so decisive? I remember her match in Rome. Gauff trailed, faced match point, and had to run down every ball. She won after more than three hours, but the lesson she took was not “patience pays off.” The lesson she told her team was: if she could win the hard way, why not try the easier way? The easier way, for her, is to finish points earlier and put pressure on from the serve and return. I was not surprised to hear her mention having “Plan A, B, C and D” in her head. A player with multiple options often hesitates. Last year’s Gauff hesitated at key moments. This version did not. She chose attack and accepted the risk. That mindset cannot exist without trust in the rebuilt serve. On the path to world No. 1, this win matters for points but even more as a signal. Gauff is defending her first Grand Slam title. If she wins the 2026 US Open and Elena Rybakina does not achieve the required result, Gauff would become world No. 1 for the first time. That pressure can shake anyone, but the way she handled a love-30 game shows she is prepared for tension. The crowd may be seduced by a perfect narrative: a young American champion, cheered by the home crowd, playing her “most complete tennis of the year.” Fans have the right to live in emotion; I have the job of living in data. The data against Jovic is beautiful, but Jovic is not an opponent who can punish short serves or unsafe net approaches. The quarter-final will be different. Mirra Andreeva, the fifth seed, just beat Anastasia Potapova 5-7, 6-4, 6-3. Andreeva is a French Open champion, belongs to the rising young generation and is not afraid of big stadiums. Gauff leads the head-to-head 5-0, but that number does not speak by itself. The issue is how Gauff protects her second serve against a returner far better than Jovic. Early, high-risk tennis can become a double-edged sword if she does not keep her unforced errors low. The beat keeper does not compose the music, but without him everything falls out of rhythm. Gauff is holding the rhythm of this tournament. She has the winning streak, the biomechanical support, the memory of saving match point, and an opponent she has never lost to. But Grand Slam tennis does not reward beautiful stats after round four. It rewards the player who remains standing when every plan is tested. I will watch how Gauff starts the fifth game of the first set against Andreeva, where nerves often show through unforced errors. If she keeps that “no regrets” rhythm until the final, her story at the 2026 US Open will not stop at the quarter-finals.