|Quicken Loans National final leaderboard|
|-18 Merritt (US), -15 Fowler (US), -14 Lingmerth (Swe)|
|Selected others: -12 Rose (Eng), -9 Owen (Eng), Davis (Eng), -8 Woods (US)|
World number 180 Troy Merritt picked up his first PGA Tour victory at the Quicken Loans National in Virginia.
USA's Merritt finished 18 under after carding a four-under 67 in the final round, three ahead of world number eight Rickie Fowler, who shot 69.
England's world number seven Justin Rose was among six players in tied fourth after shooting a one-under 70 to finish 12 under.
Tiger Woods went round in 68 to end eight under in a tie for 18th place.
Fellow American Merritt had only ever won one previous professional title at the 2009 Mexico Open, but the 29-year-old doubled his career tally in Gainesville, picking up a winner's cheque of $1.2m (£768,000) in the process.
"When it happens, you're not thinking," Merritt said of his victory. "You really don't even know what your name is."
Woods, 39, ranked 266th in the world, had recorded three missed cuts, a withdrawal and just one top-25 finish in eight starts on the 2014-15 PGA Tour before the tournament.
He said: "It was kind of a mixed bag as far as results, but the fact I had total control of the golf ball was nice."