FINAL ROUND LEADERBOARD:
-18 S Ames (Can)*, G McNeill (US), J Leonard (US)
-17 J Rose (Eng), N O'Hern (Aus) Selected others: -16 M Gronberg (Swe) -15 B Davis (Eng) -14 C Pettersson (Swe)
Rose missed out on a first victory on the PGA Tour
Justin Rose had to settle for a fourth-placed finish at the Children's Miracle Network Classic in Florida as Canadian Stephen Ames took the title.
Rose, the overnight joint-leader on 13 under, carded a final round 68 to finish a stroke behind Ames - who shot 64 - George McNeill and Justin Leonard.
The three went to a play-off and after Leonard dropped out with a bogey, Ames' par at the 15th secured his victory.
Englishman Rose, 29, is still waiting for his first win on the PGA Tour.
Leonard came agonisingly close to winning the tournament on the final hole, but his 16ft birdie putt spun out of the hole to take it to a play-off.
"To be this close and not be able to pull it out is disappointing," said Leonard. "Obviously, I thought I made it by my reaction. I was surprised it didn't go in."
When he dropped out at the 18th it was left to Ames and McNeill to battle it out, but the American's bogey on 15 cost him a chance of the trophy.
Ames celebrated his fourth PGA Tour victory and second in Florida having won the Children's Miracle Network Classic already in 2007.
"At the end of the day on Saturday, I said if I shot 64 I had a good chance at winning the tournament," said Ames said.
"Sure enough, I ended up shooting a 64, which was great."