Australian Open champion Madison Keys was undone by 89 unforced errors and was upset in the first round of the U.S. Open 6-7 (10), 7-6 (3), 7-5 by Renata Zarazua of Mexico on Monday. The sixth-seeded Keys,

Monday's match marked just the second time Keys and Zarazúa faced off. Keys won the first encounter, beating Zarazúa at the 2024 French Open. With her win Monday, Zarazúa evened the their head-to-head record.

American Madison Keys couldn't overcome unforced errors and double faults as Renata Zarazua made Mexican women's tennis history at the U.S. Open.