Serena Williams is getting closer to getting a spot in the US Open finals! The tennis player advanced to the quarter-finals today after defeating the Czech Republic's Andrea Hlavackova, and will face Serbian player Ana Ivanovic in the next round. The 30-year-old won the tournament three times so far—here's to hoping for lucky number four! And Williams is known as much for her superstar skills as her on-court fashion. Click through the gallery to see which outrageous looks of hers made our most memorable list.