Thanks to Jim Jones, we already know that rappers are ballin’. But what about the other way around? For many ballers — whether it’s basketball, baseball, football, you name it — sports isn’t enough. Earlier today, a song featuring tennis star Serena Williams made the rounds. "I ball hard no tennis racket,” she spit. “They be like Serena, is you really rapping?" Judging from the results, we’d say the verdict is still out. But Serena isn’t the first athlete to try her hand at music. Click on for other examples.