Jordan Spieth shot a course-record 63 in his final round at the Australian Open to clinch the second title of his career.

The American was tied for the lead heading into the fourth day, but Spieth pulled away from Greg Chalmers and Brett Rumford just a couple of holes into his round.

Australian Rod Pampling also finished the competition strongly to jump up into second, finishing seven-under for the tournament.

Former Masters champion Adam Scott completed the top five after his Saturday performance left him just behind the leaders, but he was unable to match Spieth and eventually finished nine shots off the top.

World number one Rory McIlroy had been in contention over the first couple of days, but slipped back to 14th after struggling on the third day, and was unable to recover as he closed 15 shots behind Spieth.