A remarkable late surge from Cameron Smith saw the Australian win his first major in stunning fashion at the 150th Open Championship in St Andrews, Scotland.

In his event debut, the 28-year-old drained five consecutive birdies as he ripped through the back nine of the Old Course, carding 8-under 64 over playing partner Cameron Young by a stroke at 20-under par.

After starting the day four shots ahead of Smith, Rory McIlroy carded a bogey-free 70 to finish two strokes back in third place.

It meant heartbreak for the Northern Irishman, who was looking to end an eight-year major drought, a day after missing the chance to see his finger slip to win a second Claret Jug.

After sharing the lead with Viktor Hovland at the summit after a pulsating duel on Saturday, McIlroy finally looked on track to win his fifth major after taking the lead at the fifth hole from the Norwegian, who shot a two-over 74 to finish fourth.

With Young missing a dramatic final eagle moments earlier, the Australian's eighth and final birdie of the round saved him from a playoff, securing victory after McIlroy failed to make the hypothetical eagle chip needed to draw level.