If the focus and desire is gone, is it time for Tiger Woods to call it a day?

Knowing when to call time on your career is one of the hardest decisions for a professional sportsman or woman to make.

Leave it too long and you risk tarnishing your legacy with a string of poor, or even downright embarrassing performances which detract from previous medal or title-winning displays.

Leave it too long in sports such as boxing and the danger is also of a physical and far greater nature, with many fighters suffering the long-term consequences of taking on one fight too many.