Serena's never been the calmest player in the sport, but she earned herself a $2,000 fine at the 2011 US Open recently after ranting at an umpire.
She launched a verbal attack on the official after she received a violation, which was the correct decision. Some 'highlights' of the rant include:
"I truly despise you. You're out of control. You're a hater and you're just unattractive inside.
Now that's not very sportsmanlike behaviour is it? Watch Williams' outburst below. But she's not the only sports person to blow their top