Serena Williams had a day of mixed emotions as she learned before her quarterfinal match that her sister Venus was upset. But, being the competitor that she is, she held her ground and defeated Na Li from China by a score of 7-5, 6-3. Now, Serena will be the heavy favorite to win Wimbledon, but first she'll have to best her next opponent in the semis, Petra Kvitova from the Czech Republic. Good luck on Thursday, Serena!!!