Zarazua knocked off Australian Open champion Madison Keys, who committed 89 unforced errors and was upset 6-7 (10), 7-6 (3), 7-5 in a first-round match.

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.

Australian Open champion Madison Keys has been undone by 89 unforced errors during a 6-7 (10), 7-6 (3), 7-5 loss to Mexico’s Renata Zarazua in the first round of the U.S.