Darlene Hard, who won 21 Grand Slams - 20 as an amateur - turns 78. Hard won 13 women's doubles titles in Grand Slam events with eight different players, with her final doubles title coming in 1969 during the Open Era, a full six years after she had retired from the game to become a coach.
Shaui Peng, half of the 2013 Wimbledon doubles championship team, turns 28. Peng teamed up with Taiwan's Hsieh Su-wei to win the title and is currently ranked No. 4 in the world in doubles.
Jamie Hampton, currently ranked No. 26 in the world, turns 24. Hampton reached the fourth round of the French Open in 2013 and reached No. 24 in the world in July of 2013.
Kirsten Flipkens, currently ranked No. 19 in the world, turns 28. Flipkens climbed to No. 13 in August of 2013 after reaching the Wimbledon semifinals. She also made the fourth round of the French Open in 2013 and has one career WTA title.