Serena Williams has history of behaving poorly - Cordwell

US tennis star, Serena Williams, has been fined US$17,000 for her three code violations in the final of the US Tennis Open. In a very public on-court dispute Williams called the umpire a thief and after the match said her treatment was sexist. Williams was pulled up for receiving advice from her coach. She was then docked a point for breaking her racquet and then hit with a penalty for verbally abusing the umpire. Retired New Zealand women's tennis great Belinda Cordwell watched the game - she talks to Guyon Espiner.