Juan Martín del Potro, the seventh-ranked tennis player in the world, won his third Citi Open title—and first since 2009—on Sunday when he beat John Isner in three sets at the William H.G. FitzGerald Tennis Center in Rock Creek Park.

The Citi Open runs through Sunday at the William H.G. Fitzgerald Tennis Stadium in Rock Creek Park.

Written by DCist contributor Joe Parilla Defending champion Juan Martin Del Potro defeated #1 seed Andy Roddick 3-6, 7-5, 7-6 (6) in the Legg Mason Tennis Classic final on Sunday. In a scintillating match between the tournament’s top seeds, Del Potro overcame a solid performance by Roddick to become the first back-to-back winner at the Washington ATP event since Andre Agassi in 1999. Del Potro, the #6 ranked player in the world, displayed an extraordinarily…