Madison Keys suffered one of the biggest upsets of the 2025 season on Monday at the US Open, losing to Renata Zarazua.

Australian Open champion Madison Keys was undone by 89 unforced errors and was upset in the first round of the U.S. Open by Mexico’s Renata Zarazua on Monday.

The sixth-seeded Australian Open champion is undone by 89 unforced errors, including 14 double faults, in a 6-7 (10), 7-6 (3), 7-5 loss to Mexico’s Zarazua, who needs to produce just eight winners