By Nick Georgandis
April 23 - Mixed doubles career Grand Slam winner Daniela Hantuchova turns 30. Hantuchova won the Australian open with Loes Friedl in 2001, the Australian Open in 2002 with Kevin Ullyett, the French Open in 2005 with Fabrice Santoro and the US Open that same year with Mahesh Bhupathi. She is one of only five women to win a career Slam in mixed doubles. She has also reached the finals of three women's doubles Slams, won nine career doubles titles and been ranked as high as No. 5 in doubles. In singles, she has five career WTA titles and has been ranked as high as No. 5, that coming in 2003. She is currently ranked 75th in the world.
April 25 - Former top 5 player and Olympic silver medalist Rainer Schuttler turns 37. Schuttler combined with fellow German Nicolas Kiefer to win the silver medal at the 2004 Summer Olympics. He won four singles titles in his career and reached No. 5 in the world in April of 2004. His best Grand Slam performance came in 2003 when he reached the final of the Australian Open, losing to Andre Agassi in straight sets.
April 26 - American John Isner, largely known for winning the longest match in tennis history, turns 28. In the first round of Wimbledon in 2010, Isner defeated France's Nicolas Mahut 6-4, 3-6, 6-7, 7-6, 70-68, setting the record for most aces in a match with 113. Isner is currently ranked No. 23 in the world, and has been ranked as high as No. 9. He has six career singles titles and three in doubles. He is also the second-tallest man to ever play tennis, standing 6-feet, 8-inches.
April 27 - Former world No. 1 Dinara Safina turns 27. The Russian was the first woman to be ranked No. 1 without winning a Grand Slam title, finishing as the runner-up at the 2009 Australian Open and 2008 and 2009 French Opens. She also won a silver medal at the 2008 Summer Olympics and won 12 singles titles overall. In women's doubles, she won the 2007 US Open with Nathalie Dechy.