Serena Williams Fights Back From Set Down To Reach US Open Semi Final

Serena Williams fought back from a set down in the U.S. Open women's quarter final against Tsvetana Pironkova Wednesday. Score: 4-6, 6-3, 6-2. It was the third consecutive match that the six time champion had to fight out for three grueling sets to enter the Semi Final. The 38-year-old American is just two wins away from a record-equaling 24th Grand Slam singles title. The match looked advantag