Federer, No. 3 in the world, fought off all seven of the break points he faced in a 6-1, 6-4 win over del Potro. Federer previously won in Rotterdam in 2005.
It was the 71st ATP tournament title for Federer, who is fourth on the all-time championships list. It marks a 12th consecutive year in which he's won at least one tournament, tying him for third on that list -- two behind all-time leader Ivan Lendl.
Federer is 9-2 versus del Potro. Both of del Potro's wins in the series came in 2009 and include a five-set victory in the final of the U.S. Open.
Sunday's pairing was nowhere near as close. Federer won the first five games of the match -- cashing in both break opportunities -- and served out for the set. Federer got a break in the fifth game of the second set while del Porto was unable to convert any of his five chances in the set.
Federer picked up about $380,000 for the win, which pushed him over the $68 million mark for his career. That is the most in ATP history and about $22 million more than Rafael Nadal, who is second on the list.