Serbia's Ana Ivanovic was upset in the first round of the U.S. Open on Monday.
Ivanovic, the No. 7 seed in the women's bracket, was defeated 6-3, 3-6, 6-3 by Slovakia's Dominika Cibulkova.
It's the first big upset of the tournament, with most ranked players on the women's side yet to begin their matches.
Ivanovic, a former No. 1 ranked player, was in search of her second Grand Slam title. Her only major win came in the 2008 French Open. She was the runner-up at Roland Garros in 2007, and in the Australian Open in 2008.
Ivanovic's furthest run in the U.S. Open came in 2012, when she made the quarterfinals.
No. 1 seed Serena Williams, the tournament favorite, will kick off her quest for a calendar Grand Slam on Monday night.
- Rohan Nadkarni