Another top seed in the women's draw is out of the U.S. Open.
Mirjana Lucic-Baroni upset No. 2 Simona Halep, the second-ranked woman in the world, 7-6, 6-2.
Lucic-Baroni came into the tournament ranked 121st in the world, so this is a major upset, and a disappointing end to the Grand Slam season for Halep.