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.

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

Australian Open champion Madison Keys suffered a shock first-round defeat against Mexico’s Renata Zarazua amid searing heat at Arthur Ashe Stadium on Monday afternoon. Keys, the world No. 6, made a staggering 89 unforced errors in a marathon match against the 95th-ranked Zarazua,