Jordan Spieth clinched victory at Royal Birkdale after coming through an enthralling battle with compatriot Matt Kuchar.
The American is the second player after Jack Nicklaus to win three of golf's four majors before the age of 24.
The world number three is also the youngest Open winner since 22-year-old Seve Ballesteros won the first of his three titles in 1979.
Spieth, who adds the Claret Jug to his victories in the US Open and the Masters, will have the opportunity to complete the career Grand Slam at the PGA Championship in August.
After blowing a three-shot overnight lead by the turn, Spieth trailed Kuchar after dropping a shot on the 13th.
But he then produced a moment of magic to record three birdies and an eagle in the space of four holes as he sealed victory by three shots.
Northern Ireland's Rory McIlroy hit a three-under 67 to tie for fourth on five under, alongside Spain's Rafael Cabrera-Bello (68).
England's world number 172 Matthew Southgate finished on four under to tie for sixth place, along with South Africa's Branden Grace, who carded the first 62 in a men's major in the third round.
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