Three weeks after winning the British Open, the 25-year-old from Northern Ireland took his second major victory in a row and third consecutive triumph overall in impressive fashion yesterday.
McIlroy fired a three-under par 68 in the final round to finish 72 holes on 16-under par 268 and edge five-time major winner Phil Mickelson by one shot with Sweden's fourth-ranked Henrik Stenson and British and US Open runner-up Rickie Fowler two adrift.
The 25-year-old from Northern Ireland took the Wanamaker Trophy, even grabbing the lid as it fell during the awards ceremony, and a $1.34 million (7.45 million euro) top prize.
McIlroy became the fourth-youngest man to win his fourth major, trailing only Young Tom Morris, Tiger Woods and Jack Nicklaus, and has taken four of the past 15 majors contested.
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Drenched by 2.2 inches of rain in three days, Valhalla offered birdie chances while the back nine turned up the tension and produced a spectacle.
McIlroy opened the back nine with an eagle, added a birdie on 13 and sank a tense 10-foot birdie putt at the 17th hole to seize a two-stroke advantage.
McIlroy found the right rough off the tee at the par-5 18th and a greenside bunker with his approach while Mickelson and Fowler were on the green. Mickelson missed an 70-foot eagle bid but tapped in for birdie to pull within one of McIlroy while Fowler settled for par to end his title hopes.