The 2026 US Open (WTA) and 2026 US Open (ATP) third round delivered seismic upsets on Saturday as multiple top-10 seeds fell and underdogs surged toward the second week. Zheng Qinwen mounted a stunning rally against American 22nd seed Madison Keys, fighting back from 5-0 down in the deciding set and staring down match point to prevail and climb 41 ranking points. On the men's side, Francisco Cerundolo executed an extraordinary comeback against No. 9 seed Taylor Fritz, squandering a two-set lead to fall 3-6, 4-6, 6-3, 6-4, 6-4 in a match Fritz described with visible emotional devastation.
Naomi Osaka also advanced despite second-set struggles, rallying from 4-2 down in the third set, while Coco Gauff advanced in straight sets against Cristina Bucsa while yet to drop a set in the tournament. Australian wildcard Dane Sweeney saw his career-changing run come to an end with a third-round loss to seeded Italian Luciano Darderi, while Venus and Serena Williams exited the doubles draw, falling to 14th seeds Chan Hao-Ching and Maya Joint. Six top-10 seeds have now departed in the men's draw alone. Osaka awaits a Monday fourth-round showdown against Australian Open champion Elena Rybakina, while the second week promises further drama as remaining seeds navigate an increasingly unpredictable draw.