Battling the effects of vertigo, Australia’s Jason Day carded a final-round 74 to finish tied for ninth at the US Open, five shots behind champion Jordan Spieth.

Spieth finished on five under after a final-round 69, one clear of South African Louis Oosthuizen and American Dustin Johnson.

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It was the 21-year-old Texan’s second major, after he took out the Masters in April.

Playing in the final group, Johnson had a chance to win with a 12-foot eagle putt on the last hole but he three-putted to hand Spieth the title.

Spieth is just the sixth player in history to win the Masters and US Open in the same year, joining Tiger Woods (2002), Jack Nicklaus (1972), Arnold Palmer (1960), Ben Hogan (1951, 1953) and Craig Wood (1941).

He can complete a grand slam if he wins the British Open and US PGA Championship later this year.

Australians Adam Scott (64) and major debutant Cameron Smith (68) were tied fourth at three-under with South Africa’s Branden Grace.

– with AAP