Sportsmen who failed to reach their potential

Ben Foster - the obvious England no 1 and the natural successor to Edwin van der Sar at Manchester United. Apart from it hasn't worked out that way.

Click here or click the image to launch our guide.

Foster's omission from the England squad this week has been blamed on injury, but one can't help wonder if he would warrant a place in the squad even if he was fit.

Given his chance this season, Foster's performances have been met with much criticism and with van der Sar on the verge of returning to action, the 26-year-old may have missed the boat.

Foster is only young and has time to redeem himself, but as this controversial guide suggests, he wouldn't be the first sportsman to fail to reach his potential.