It used to be teen queens like Martina Hingis winning Grand Slams. Not anymore. Three of the four US Open women's semifinalists are over the age of 30 due in large part to more comprehensive fitness and nutritional plans
Top-seeded Americans Serena Williams, Sloane Stephens and Jamie Hampton all advanced to the third round of the US Open. Unfortunately, only one has the possibility to advance to the quarterfinals due to the draw.