NEW YORK :Sixth seed Madison Keys struggled to find any rhythm as her quest for a hardcourt Grand Slam double went up in flames after a 6-7(10) 7-6(3) 7-5 defeat by unseeded Mexican Renata Zarazua in the first round of the U.S. Open on Monday.

The 30-year-old American, who lifted her maiden Grand Slam trophy at the Australian Open in January, made a staggering 89 unforced errors with 14 double faults and became the highest seed to exit the women's draw at the year's final major.

"I'm just very happy obviously coming in to the match I was like almost crying because I was really nervous but I think the crowd made it so chill for me... thank you guys, for staying," Zarazua said.

"I know my game is a bit tricky so sometimes people get a bit bored ... We don't have many tennis players as you

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