There are a number of candidates who will be competing long after Venus and Serena Williams hang up their tennis shoes, as evidenced by the number of American women making it past the US Open first round.
Second-seeded Simona Halep needed three sets to win her first-round match at the US Open. Ditto for Angelique Kerber, Venus Williams and Andrea Petkovic. Sometimes the early pressure is the most intense pressure.
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