LONDON (AP) -- Novak Djokovic made his way back into the championship match at the ATP finals, beating Juan Martin del Potro 4-6, 6-3, 6-2 Sunday.
The 2008 champion was broken early in the second set, but he broke right back to 2-2 and then took Del Potro's serve again to take a 5-3 lead.
In the third, Djokovic won 12 of 13 points in a three-game stretch to lead 3-1. He broke again three games later.
In the other semifinal match at the O2 Arena, six-time champion Roger Federer will face Andy Murray. Federer beat Murray in the Wimbledon final to win his seventh title at the All England Club, but Murray bounced back to defeat Federer in the Olympic final on the same Centre Court grass.