Paris: Serena Williams was left furious following her bombshell second round exit from the French Open but vowed to work "five times harder" to repair her bruised status as the world's best player.


Serena Williams reacts during a break at Roland Garros yesterday. Pic/Getty Images 

To cap off a miserable day for the Williams' family, sister Venus was also knocked out as the two American superstars lost at a major on the same day for only the fourth time.