No. 6 seed Madison Keys was bounced from the U.S. Open in the first round when she fell 6-7 (10), 7-6 (3), 7-5 to unseeded Renata Zarazua of Mexico on Monday in New York.

The match was on serve in the third set until Zarazua broke Keys for a 5-3 advantage. Keys broke back in the next game and brought the set even at 5-5, but Zarazua broke Keys again in the 12th game and won on her first match point.

It was the first victory over a top-20 player in Zarazua's career as she grabbed her head in disbelief after securing the win.

Zarazua took advantage of 89 unforced errors from Keys and won despite her opponent's 46-8 advantage in winners.

Zarazua advanced to meet France's Diane Parry in the second round. Parry was an easy 6-1, 6-0 winner in the first round against Czechia's Petra Kvitova.

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