London, Nov 22: Jo-Wilfried Tsonga earned his first win at the ATP World Tour Finals on Tuesday, beating Mardy Fish of the United States 7-6 (4), 6-1 in his second Group B match.
Fish seemed to be slowed by the left hamstring injury that has disrupted the end of his season, while Tsonga struggled to find consistency.
The sixth-seeded Frenchman was twice up a break in the first set before finally taking it in a tiebreaker. The second set began with another exchange of breaks but Tsonga eventually ran away with it.
Defending champion Roger Federer was to face long-time rival Rafael Nadal later Tuesday at the O2 Arena.