London, Nov 8 (EFE).- Spain's Rafael Nadal overcame a rough patch in the middle of Friday night's round-robin match against Tomas Berdych at the Barclays ATP World Tour Finals, righting the ship in time for a 6-4, 1-6, 6-3 victory.
Nadal got an early break and rolled to a comfortable first-set victory against the Czech, a player he has not lost to since 2006.
But Berdych - who needed to win the match to reach the semifinals of this year-end indoor hard-court event, played at London's O2 Arena - reeled off five straight games in the second set before Nadal got on the scoreboard.
The third set was tightly contested until Berdych threw a service game away with double faults to go down 3-5. Nadal then served out the match in his first opportunity, whipping a forehand passing shot past the Czech on match point.
Swiss Stanislas Wawrinka, who defeated Spain's David Ferrer earlier in the day 6-7 (3-7), 6-4, 6-1, clinched the other semifinal berth out of Group A with Nadal's victory.
In Group B, Serbian world No. 2 Novak Djokovic has already advanced out of the round-robin phase, while Argentine Juan Martin del Potro and Swiss Roger Federer will play off Saturday for the last semifinal berth.