Melanie Oudin
The biggest upset on the women's singles side at Wimbledon 2009 through the third round is that of Melanie Oudin beating No. 6 seed Jelena Jankovic. Oudin beat Jankovic, the former world No. 1, 6-7, 7-5, 6-2.
Oudin, a 17-year-old American, was selected for Fed Ex Cup play earlier this year. She had to win three qualifying matches to get into this Wimbledon, but will move into the Top 100 singles rankings regardless of what she does after this.