Jo-Wilfried Tsonga remains in the hunt for a place in the semi-finals of the ATP World Tour Finals after the French sixth seed defeated America's Mardy Fish 7-6 (7/4), 6-1 on Tuesday. Tsonga, who lost his opening Group B match against Roger Federer, still has to beat Rafael Nadal in his final fixture on Thursday to have a chance of advancing, while Fish faces an early exit from the season finale at London's O2 Arena.