Coco Gauff Grand Slam Defence

Coco Gauff's US Open title defence at age 21 in 2025 ranks as a greater surprise than #1 Sinner's rise, given she entered as the #7 seed after a mid-season slump. She defeated both Iga Swiatek and Aryna Sabalenka—who combined for 12 Grand Slams—without dropping a set, averaging 71% first-serve points won. Her improved serve speed of 120 mph was 15% faster than the average WTA winner, and the triumph marked only the third successful women's title defence in ten years, cementing Gauff as the youngest two-time US Open champion of the modern era.