Andre Agassi claimed the Nasdaq-100 Open title after an enthralling 6-3 6-3 3-6 6-4 victory over Switzerland's Roger Federer.

The American won the first two sets with relative ease before the 20-year-old from Basle staged a comeback to win the third and take an early break in the fourth.

But Agassi showed all his experience and considerable determination to break back and then take the match as Federer served at 5-4 down.

The victory means the 31-year-old from Las Vegas has won the Miami tournament a record five times.

The result had looked in the balance when Federer served for a 5-3 lead in the fourth set.

Agassi broke the Swiss though to level it at 4-4 and found new depths of reserve to breeze through his next service game with the assistance of two aces.

Federer crumbled under the pressure, dropping his next service game, to succumb to his third defeat in three meetings with the former world number one.

Agassi's win enabled him to become just the ninth man in ATP history to register 700 match victories.

The first two sets went the American's way as Federer struggled to cope with Agassi's power from the back of the court.

Agassi broke three times in the first compared to Federer's one as his famed return of serve found top gear.

Federer tightened up his delivery in the second but was still unable to prevent Agassi breaking once to take a commanding two-sets-to-love lead.

The nature of the match changed dramatically in the third, Agassi visibly wilting as the younger man seemed to move up a level.

The 20-year-old gained his first break since the second game of the first set to grab a 3-1 lead and backed it up by winning his own serve to take the set 6-3.

Federer's rise continued with an early break at 1-1 and he looked reasonably comfortable until Agassi's late rally.

The veteran restored parity and then broke Federer again to claim an impressive victory.