( CNN ) -- Sixth seed Juan Martin Del Potro , in his first Grand Slam final , stunned defending champion and top seed Roger Federer to take the men 's singles title at the U.S. Open in New York . Juan Martin Del Potro celebrates after beating Roger Federer during the final on Monday . The 20-year-old Argentinean took the Swiss world No . 1 to five sets , including two tiebreakers that went Del Potro 's way , winning 3-6 7-6 ( 7-5 ) 4-6 7-6 ( 7-4 ) 6-2 . Del Potro 's win , which took four hours and six minutes , ended Federer 's five-year reign at the U.S. Open . Federer , 28 , was seeking his sixth consecutive U.S. Open win , which would have equaled the feat achieved in 1925 by American Bill Tilden , who then went on to claim his seventh U.S. Open title in 1929 . Federer had already won this year 's French Open and Wimbledon titles and was Australian Open runner-up . Federer claimed the opening set after leading 3-0 at the beginning , and he achieved an early break in the opening game of the second set as well . However , Del Potro broke back when Federer was serving for the second set at 5-4 up , with the set eventually going to a tie-break . Federer had never lost a tiebreak in a U.S. Open final , winning his four previous ones , but Del Potro ended that sequence by taking the tie-break 7-5 to tie the scores . The third set included a failed challenge by Del Potro , an angry response by Federer to the chair umpire , and a couple double-faults by the Argentine to give the Swiss the set . Del Potro returned to form in the fourth set that saw Federer near victory but not attain it as his young opponent again won the tiebreak . Del Potro sped to a 5-2 lead in the fifth set on his serve , and the next game went to deuce before Federer double-faulted and then overshot a backhand to concede the title . Del Potro won more points than Federer , who had 11 double-faults as well as 13 aces . Del Potro , a quarterfinalist last year , had reached the finals after beating 16th seed Marin Cilic of Croatia in the quarterfinals and then crushing third seed Rafael Nadal of Spain in the semifinals . After defeating Nadal , Del Potro had then called the victory `` the best moment of my life . ''
Argentinean takes champion to five sets , winning 3-6 7-6 ( 7-5 ) 4-6 7-6 ( 7-4 ) 6-2 . Federer was aiming to equal Bill Tilden 's record of six successive U.S. Open wins . Federer had so far this year won the French Open and Wimbledon titles . Del Potro , 20 , won his first Grand Slam title after reaching final for first time .