Australian Open champion Madison Keys is upset in US Open’s first round by Mexico’s Renata Zarazua of Mexico

New York
AP
 — 

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 Mexico’s Renata Zarazua on Monday.

The sixth-seeded Keys, who was the runner-up at Flushing Meadows in 2017, made so many mistakes,…