NEW YORK -- Even for the mathematics major from Clemson, it just didn't add up: How could someone who recently struggled so badly she wanted to quit tennis stay on the court with the No. 1 player in the world?
Ana Ivanovic probably wondered the same thing.
In one of the biggest upsets in the sport's history, the top-seeded Ivanovic was ousted from the U.S. Open, stunned by 188th-ranked Julie Coin 6-3, 4-6, 6-3 in the second round Thursday.
"Obviously, if you would ask me at the moment if I'm playing like a No. 1, probably not," Ivanovic said. "It's very frustrating because I know I can play so much better."
Never before in the Open era that began in 1968 had the No. 1 woman lost this early in the tournament. Plus, all the favorites had been breezing at Flushing Meadows.
The French Open champion seemed to be rallying in the third set when Coin suddenly recovered to win 10 straight points. The 25-year-old French math whiz screamed when Ivanovic's last shot sailed out, then hopped for joy and hit an extra ball high into the stands.
Venus Williams and sister Serena won earlier in the day. James Blake, David Ferrer, Andy Murray and Dinara Safina joined them in moving into the third round.