5. Lleyton Hewitt
Not a name you usually associate with temper tantrums, former world no. 1 Lleyton Hewitt can spit fire, Aussie style. He’s not afraid to play the race card, once calling out a Black linesman of ruling in favor of James Black because they were both Black. In another match, Hewitt went ballistic upon thinking he heard a linesman call a fault and failing to get said linesman to admit it.