Australian golf star Jason Day has run away with the first event of the US PGA Tour’s lucrative end-of-season playoff series to assume top spot in the FedExCup standings.

Backing up from his major breakthrough at the PGA Championship, Day carded a brilliant bogey-free final-round eight-under-par 62 at The Barclays in New Jersey on Sunday to secure his third victory from his past four starts.

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The world No.3 finished at 19-under for the championship, six shots clear of Swede Henrik Stenson (66) and will head to the second event in the four-tournament playoffs in Boston starting on Thursday in pole position to land the $US10 million ($A13.96 million) bonus prize.

In addition to the $US1.485 million ($A2.07 million) winner’s purse, Day also collected 2000 FedExCup points for his latest success to leap from American trio Jordan Spieth, Bubba Watson and Jimmy Walker in the overall standings.

– AAP