'I must imrpove to lift trophy': Nadal

Rafael Nadal got his French Open title defence off to a winning start – but the Spanish king of clay admitted he would need to improve on a sluggish first round performance.

Nadal, who has won the singles title at Roland Garros for the past two years, struggled at first but finally got into the groove to seal a 7-5 6-3 6-2 victory over Juan Martin Del Potro of Argentina on the Philippe Chatrier court.