LONDON -- Novak Djokovic survived an early setback, and then made it look all too easy.The second-ranked Serb, who has a chance to reclaim the No. 1 ranking at the O2 Arena next weekend, rallied to beat Dominic Thiem 6-7 (10), 6-0, 6-2 Sunday in his opening match at the season-ending ATP finals.Djokovic won nine of 10 games to take control of the match after losing the first set in a tiebreaker. And even that was close.Yeah, a thrilling tiebreaker, Djokovic said. I had, I think, only one set point. He just played a good point. I was in the rally, but he just was going for his shots.Thiem had his first three set points at 6-3 in the tiebreaker, but he double-faulted twice and then put a backhand into the net to make it 6-6.Djokovic had a chance, too, leading 9-8. But he couldnt close it out with Thiem serving, eventually hitting a backhand long. The Austrian finally won it on his seventh set point with a forehand winner, prompting Djokovic to smack a ball into the crowd.After that, it was just about all Djokovic. The Serb reeled off six straight games to send it to a third set, and then broke Thiem twice more to close it out.Even though I lost the first set, I thought I didnt do too many things wrong, said Djokovic, who saved the only break point he faced. It was just the very high quality of his game that prevailed in the first set.In the following sets, it got to be too much for the Austrian, who was making his debut at the tournament for the top eight players in the world.I lost a little bit energy, not much, but just a little bit (after the first set), Thiem said. Of course, against a player like Novak, he immediately steps up. Thats how the second set went.Thiem said he had a chance to meet Manchester United manager Jose Mourinho after the match, and the pair chatted briefly. Thiem is a fan of English club Chelsea, a team Mourinho has coached in the past.In the late match, fourth-seeded Milos Raonic of Canada beat sixth-seeded Gael Monfils of France 6-3, 6-4.Monfils, who was playing at the ATP finals for the first time, hit a pair of tweeners in the match, but it was Raonic that got the breaks -- one in each half.Djokovic lost the No. 1 ranking to Andy Murray last week, but he can earn it right back in London. If either of the two wins the title next Sunday, that one will be assured of the top ranking -- as long as Djokovic wins another round-robin match on the way to the final.If Djokovic does reclaim the No. 1 ranking, he would finish the season at the top for the third season in a row and the fifth time in six years. Murray is trying to end up as the top man for the first time.With a victory on Sunday, Djokovic can also join Roger Federer as the only players to win the season-ending tournament six times. Federer is not playing in London, sitting out the rest of the season as he continues to recover from knee surgery.Djokovic has had his own injury problems this season, including pulling out of the China Open with an elbow injury in September. In Sundays match, he called for a trainer during the first changeover, but it was because he hurt his thumb on the court after reaching for an early shot.It was just a nasty cut that I had when I didnt manage to return the serve, the first serve, Djokovic said. Just kind of caught the surface, then I cut myself. It was bleeding. I just wanted to stop the bleeding. Trevor Story Jersey . Both players have lower body injuries that will keep them out of the lineup until at least January 31, which is the first game they can be activated from IR. Cheap Rockies Jerseys Authentic . 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Visiting teams Britain, Argentina, and France all won hard-fought doubles matches to take 2-1 leads in the Davis Cup quarterfinals on Saturday.Meanwhile, the United States couldnt finish off Croatia in Portland, after Marin Cilic and Ivan Dodig gave the brothers Bob and Mike Bryan only their fifth loss in cup doubles, 6-2, 2-6, 6-2, 6-4, and kept the tie alive into Sunday.Jamie Murray and Dom Inglot put Britain in position to move its cup defense into the semifinals after beating Serbias Nenad Zimonjic and Filip Krajinovic 6-1, 6-7 (2), 6-3, 6-4 in Belgrade.Dusan Lajovic won the second singles suspended overnight when he beat Jamie Ward in straight sets in the morning to level the tie, but Serbia captain Bogdan Obradovic decided to rest Janko Tipsarevic from the doubles and save him for the reverse singles on Sunday.The veteran Zimonjic was paired for the first time in the cup with Krajinovic, who played with an injured wrist and viral infection but dominated the partnership.On Sunday, Kyle Edmund has a chance to clinch a tie for the first time when he plays Lajovic.If Britain win, it could play Argentina, which was on the cusp of an 11th semifinal in 14 years after Juan Martin del Potro and Guido Pella won their first doubles match together.Del Potro and Pella outlasted Fabio Fognini and Paolo Lorenzi 6-1, 7-6 (4), 3-6, 3-6, 6-4 over nearly four hours in Pesaro, Italy.Fognini began the day by playing the second singles that never started on Friday because of bad light and weather. He bounced Juan Monaco, playing in his first tie in 2 1/2 years,, 6-1, 6-1, 7-5, and was so fresh that Italy put him in the doubles and pulled Marco Cecchinato.ddddddddddddTwo hours later, Fognini looked fresh but was let down by Lorenzi.Del Potro, the 2009 U.S. Open champion, was playing his first tie in nearly four years, and his first Davis Cup doubles, but there was no empathy from Italian fans, whose whistling when he served eventually drove the umpire to warn the fans.On Sunday, the winners of the opening singles meet, Argentinas Federico Delbonis and Fognini, in what could be the deciding match.Wimbledon doubles champions Nicolas Mahut and Pierre-Hugues Herbert of France won on their cup debut when they prevailed against hosts Lukas Rosol and Radek Stepanek 6-1, 3-6, 6-3, 4-6, 6-4 in Trinec.Rosol beat Jo-Wilfried Tsonga in a five-set singles on Friday, but was summoned to replace Adam Pavlasek, who had a back problem. Rosol struggled on serve, and was broken in the opening game of the final set in what turned out to be the decisive break.Tsonga could still have a say in the first reverse singles on Sunday, when he plays left-handed Jiri Vesely for the first time, with a chance for France to win on Czech soil for the first time in 90 years.In Portland, Cilic, despite losing a five-set singles on Friday, replaced Marin Draganja in doubles, and the move paid off as Croatia won to cut the Americans lead to 2-1. Cilic has the first reverse singles on Sunday, against John Isner. ' ' '