Australians Marc Leishman and Curtis Luck have tied for fifth, three shots behind winner Kyle Stanley at the US PGA event in Potomac.
Stanley beat Charles Howell III in a sudden-death play-off.
The 20-year-old Luck, in his rookie year on the tour, was the best-placed Australian midway through Sunday's final round at two-shots off the pace.
But a bogey on the 11th hole contributed to him carding an even-par 70 for the day and four-under for the tournament.
Leishman sunk five birdies to go with a bogey on Sunday for a four-under final round, storming up the leaderboard after starting the day in a tie for 18th.
The pair were in an eight-way tie for fifth.
Geoff Ogilvy was a shot behind his fellow Australians in a tie for 13th.
Ogilvy appeared to be finishing strongly with birdies on the par-four 14th, 15th and 16th holes.
But he faltered with bogeys on the final two holes.
Stanley and Howell each carded four-under 66 for the round to finish at seven-under for the tournament.
A par on the first play-off hole was enough to give Stanley the second PGA tour victory of his career.
"It means a lot, it's hard to put into words right now," said an emotional Stanley, whose previous victory came at the Phoenix Open in 2012.
"(This win) is confirmation we've been working on the right things, and if anything will make me a little bit hungrier to get to work."
Overnight leader David Lingmerth stumbled home with a three-over 73 to finish in the group of eight players sharing fifth place at four under.
Howell III was returning from a rib injury that kept him out of tournament action for more than two months and his 16th career second place earned him a spot in this month's British Open in Southport.
"I'm excited to be back, it's a wonderful event," Howell III said. "It was a long nine weeks, it's great to be healthy."
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