(CNN) -- Luke Donald has overtaken Lee Westwood as world number one after beating his fellow-Englishman in a dramatic playoff to win the PGA Championship at Wentworth on Sunday.
The pair finished the tournament locked together on six-under-par 278, after Westwood carded a final round three-under 68 and joint overnight leader Donald posted a one-under 70.
That meant they re-played the 18th hole again, only for Westwood to find water with his approach shot to the green, handing his rival and Ryder Cup teammate victory and top spot in the world ranking.
The victory, 33-year-old Donald's fifth European Tour win, means he becomes the third Englishman to top the rankings -- after Nick Faldo and Westwood -- and goes some way to making amends for the disappointment of finishing a narrow second to Simon Khan in last year's tournament.
"I have been runner-up a few times in my career, a few times this year, and to come through in these circumstances, in one of the biggest tournaments in the world, going head-to-head with Lee, is pretty special," Donald told the official European Tour website.
"It doesn't get much better. I'm not sure if there will ever be a case where number one and number two in the world are playing off for a tournament, but also with a chance of taking the number one ranking in the world.
"I think a piece of unique history has been made, and I am glad to be a part of it," added Donald. "This is the flagship event and with the four major champions here, and everybody from the Ryder Cup, it is very special to win."
A disappointed Westwood added: "It's amazing that I went in the water, but it shouldn't have gone to a playoff.
"I had a good chance at the 17th hole, going in with a three iron, and on the last I just misread it."
Simon Dyson carded a final round 69 to finish two shots behind in third place, the first all-English one-two-three in the event since 1974, but Italian Matteo Manassero -- who shared the overnight lead with Donald -- faded out of contention with a 75.