LOS ANGELES (Reuters) Second seed Sam Querrey saved a match point in the second set before upsetting top-seeded Briton Andy Murray 5-7 7-6 6-3 to retain his LA Open title on Sunday. The big-serving American, who had not won a set in four previous meetings with Murray, produced his best tennis of the week to wrap up victory in two hours 22 minutes at the LA Tennis Centre. After breaking the world number four in the sixth game of the final set, Querrey clinched his fourth ATP Tour title of the year, and his sixth overall, when his opponent hit a backhand service return long. The 22-year-old punched his right fist into the air in delight after becoming the first player to win back-to-back LA Open crowns since fellow American Andre Agassi in 2002. This is just a great tournament for me, a beaming Querrey said courtside after completing his fourth successive three-set match of the week. I cant wait to come back next year. Murray, who had been bidding for his first title of the year in his first tournament back since his semi-final loss to Rafa Nadal at Wimbledon, paid tribute to Querrey. Id like to congratulate Sam, the 23-year-old Scot said. He had tough matches this week and great job for coming through again. FIRST TIME This is my very first time here in LA and I really enjoyed it, added Murray, a late addition to the draw after the withdrawal last week of world number two Novak Djokovic. Querrey broke Murray in the third game of the match but failed to hold serve in the eighth and 10th to lose the opening set. The American smashed his racket in frustration after double-faulting on set point. Urged on by his bare-chested 'Sam-urai supporters, Querrey failed to convert two breakpoint chances in the fifth game of the second set and Murray followed suit with one missed chance in the eighth. In the 10th, Querrey faced a match point on serve at 30-40 after pushing a forehand wide but he escaped when the Scot missed an attempted backhand winner down the line before going on to hold. The set went into a tiebreak which the American, roared on by his fans, dominated to clinch 7-2. He punched his right fist into the air in celebration after levelling the match with a forehand winner down the line. The final set went with serve until Murray was broken in the sixth game, dumping a backhand drop shot into the net to trail 2-4. Serving for the match at 5-3, Querrey faced a break point at 30-40 but he saved that with a forehand winner before holding for victory.