PHOTOS: Bikini-Clad Serena Williams Shows Off Her Killer Curves

Serena Williams turned up the Miami heat as she hit the beach in a bikini and RadarOnline.com has the photos.

The tennis ace hasn't played competitively since July 2010 due to a series of health problems but she looked fighting fit once more as she soaked up the sun Saturday afternoon.

The 13-time Grand Slam winner is anxious to get back to her old competitive self and earlier this week tweeted that she's back on the court, working at her game.