With all the postponed matches from the day before, Day 4 of the Family Circle Cup was an amazing day of high-caliber tennis! Serena Williams, Venus Williams, and Jelena Jankovic…all former #1s in the world, and all former champions here…made it through to the semi-finals. Caroline Wozniaki…also a former #1 and a former champion…was upset by brilliant shot-making by Stefanie Voegele. So the stage is set for some HUGE matches to happen today!!! Stay tuned…