The Warrnambool golfer finished as the best Australian, six strokes behind eventual winner Justin Rose and one stroke better than fellow Aussie Jason Day.

Leishman had a strong finish to the tournament after he was tied for ninth heading into the final round.

He was eight shots off the pace following opening scores of 71, 70 and 67.

A sound 68, which included two birdies from the last five holes, in the final round at Aronimink Golf Club boosted him to a total four-under-par-276.

Leish man benefited from a conservative game plan after playing too aggressively at the US Open.

"I played a lot smarter than I have been, with more patience than at the US Open," he told AAP.

The placing earned the 26-year-old a sizeable $US199,950, bumping up his total prizemoney from this year's circuit to $US1,080,962.

It is expected to be enough for him to contest his third US PGA Tour next year.

He sits 48th on the official money list, with the top 125 golfers on the list retaining their card.

Leishman earned $US1,742,243 in 2009, which saw him crowned US PGA Tour rookie of the year.

He led the Australian contingent at the AT&T, sharing seventh position with American Nick Watney (276).

The result marked Leishman's second top 10 finish on this year's tour, his best performance since finishing equal runner-up in the Farmers Insurance Open in January.

After missing the cut in his past two events, the Memorial Tournament and the US Open, Leishman - who was unable to be contacted by The Standard yesterday - will carry solid form into the British Open, where he will make his debut on July 15.

Also contesting the major is Englishman Justin Rose, who showed the colonials a thing or two by winning the AT&T National on American Independence Day.

Rose recovered from consecutive three-putts early on the back nine to secure a one-stroke victory over American Ryan Moore .

The 29-year-old Englishman tapped in from 60cm at the final hole to clinch his second victory in three starts, after winning the Memorial tournament last month.