Sue Barker hosts live coverage from the opening day of the ATP World Tour Finals from the O2 Arena in London. This season-ending tournament, where £3.75m in prize money is on offer, pits the best eight players in men's tennis against each other in a round-robin format. The top four performers will go through to the semi-finals, with the two winners battling it out in Sunday's final.

Commentary by Andrew Castle and Tim Henman. Show less