Del Potro determined to return

Former US Open champion Juan Martin del Potro has vowed to come back despite 15 "sad" and "sombre" months of injury hell. Speaking in a Youtube video, the 26-year-old spoke of his determination to play again despite needing a third operation on his troublesome wrist in just 15 months. The 2009 US Open winner has dropped to 578 in the world but he's not giving up.