John Isner of the United States beat Argentina's Nicolas Almagro 6-3, 7-5 in the final of the U.S. Men's Clay Court Championship on Sunday.
Isner won his first tournament of the year and the sixth of his career. He had seven aces in the match, giving him a record 64 for the tournament.
He broke the record of 60 set by Pete Sampras in 2002. Almagro leads the ATP Tour with 266 aces. He had five against Isner.
Isner had aces of 144 and 142 mph in the 10th game to hold serve.
The players were on serve in the second set until Almagro was broken in the 11th game at the fourth break point on Isner's forehand that landed in front of Almagro and out of his reach. Almagro double-faulted twice in the game.
Isner then served for the match in the 12th game. He added his final ace bringing the final to match point and Almagro popped up Isner's final serve to end the match.