Del Potro claims nervy ATP win

Juan Martin del Potro boosted his hopes of qualifying for the semi-finals of the Barclays ATP World Tour Finals at London's O2 Arena today with a nervy 6-4 3-6 7-6 (7/1) victory over Fernando Verdasco in this afternoon's Group A clash.

With both players having lost their opening match - Del Potro to Andy Murray and Verdasco to Roger Federer - they knew this contest could make or break their chances.