NEW YORK — Australian Open champion Madison Keys was undone by 89 unforced errors and was upset in the first round of the U.S. Open 6-7 (10), 7-6 (3), 7-5 by Renata Zarazua of Mexico on Monday.

The sixth-seeded Keys, who was the runner-up at Flushing Meadows in 2017, made so many mistakes, including 14 double-faults, that Zarazua needed to produce just eight winners to earn the biggest victory of her career.

The 82nd-ranked Zarazua had lost in either the first or second round in all eight of her previous Grand Slam appearances.

Keys earned her first major championship at Melbourne Park in January, defeating No. 1 Aryna Sabalenka in the final.

In addition to her run to the final in New York eight years ago before losing to good friend Sloane Stephens, Keys was also a semifinalist at the

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