Top two seeds into Washington final

Top seed Andy Roddick will meet defending champion Juan Martin del Potro in the final of the ATP Legg Mason Tennis Classic on Sunday.

The American, playing in his first tournament since taking a break after the Wimbledon final to recover from a hip injury, dropped the first set against compatriot John Isner on Saturday night but responded superbly to secure a 6-7 (3/7) 6-2 7-5 victory.

Argentinian second seed Del Potro earlier enjoyed a smoother passage to the final, beating Chilean fourth seed Fernando Gonzalez 7-6 (7/2) 6-3.

Del Potro is attempting to become the first man to clinch back-to-back titles in this event since Andre Agassi achieved the feat 10 years ago.