Serena Williams is a dominant force in women's tennis, and to become such a dominant force you need to be tough.  But it wasn't until recently that we found out how tough Serena really is... or should I say temperamental?  In fact, I think temperamental is an understatement.  Is anyone else wondering about possible steroid use?  After all, she is built like a linebacker.  A warning to linesmen at Serena's future matches: don't call foot faults on match point or you just may get a ball shoved down your throat.