Breakthroughs by Andy Murray, Stanislas Wawrinka key to building future fan base.
Aussie Open champion Li Na turns 32
The former ATP World Tour star, Todd Martin, will assume the role in April 2014, and will take over as CEO in September 2014.
Andy Murray drops to No. 7
Victoria Azarenka Drops to No. 4 behind Li
McEnroe's new role at ESPN extends into other sports.
John McEnroe turns 55