John Isner defeated top seed Nicolas Almagro 6-3 7-5 to claim the title at the 2013 US Men's Clay Court Championship.
This is Isner's first career title on clay, and came against a player who owns the third-most clay court match wins among active players in Almagro.
Almagro got the first lead of the day with a break in Isner's second service game to go up 2-1. He then held to extend that lead to 3-1, but Almagro won just six more points while Isner won the next five games to take the opening set in just 30 minutes.
Early in the second set, it seemd like Almagro was poised to take a lead. He lost just one point in his first three service games while testing Isner with a pair of break chances in his first two service games.
In the ninth game, Isner finally got a break chance, but couldn't convert.
Almagro then fell into a love-40 hole in the 11th game. Though he battled back to get to deuce, Isner earned a couple more break chances and converted the second to go up 6-5.
The 6-foot-9 American then served out for the title.
Isner ends the tournament with 64 aces, surpassing the previous tournament record of 60 that had been set by Pete Sampras in 2002. It's his sixth career title overall.
Almagro was playing in his 19th career clay court final.