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

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.