6 seed Madison Keys in three sets to move on to the second round of the US Open. (1:14)Open Extended ReactionsNEW YORK -- Australian Open champion Madison Keys was undone by 89 unforced errors and was upset in the first round of the US Open 6-7 (10), 7-6 (3), 7-5 by Mexico's Renata Zarazúa on Monday. 82, had lost in either the first or second round in all eight of her previous Grand Slam appearances. Before Keys, the last American woman seeded in the top 10 to lose in the first round at Flushing Meadows was No. Russians Anna Kalinskaya (29) and Daria Kasatkina (15) were among the seeded players to move into the second round.