|Duval - with his trophy.|
Duval, the overnight leader, posted a two-under 69 to finish 72 holes tied with Teshima at 15-under-par 269. The duo were five strokes ahead of 2000 champion Shingo Katayama and Scott Laycock.
The playoff came about because of the way Duval played the par-three 17th hole at Phoenix Country Club. His tee shot landed 35 feet from the hole and he lagged his birdie try five feet short of the cup.
Duval failed to convert the par attempt and then missed a three-footer coming back to card a double-bogey five.
Duval, ranked third in the World Golf Rankings, had a chance to win the tournament at 18 but his 12-foot birdie try did not fall into the cup.
Teshima birdied three holes in a row, starting at the 14th, to move up the leaderboard en route to a 65 on Sunday.
At the first playoff hole, the par-five 18th, Duval drove into the fairway and hit a clumsy a 3-iron into a greenside bunker. Teshima did not have the same fortune as his tee shot landed next to a tree and he could only advance the ball 100 yards.
Teshima found the same bunker as Duval on his third shot and after Duval nearly holed his third from 60 yards out of the sand, he tapped in for the birdie and the win.
"It was very important for me to come over here and win on foreign soil," said Duval, the winner of this year's Open championship. "It was a little ugly at the end but I won."
Next up for Duval is the World Golf Championships - EMC World Cup at the Gotemba Course at Taiheiyo Club in Shizuoka. He will team with Tiger Woods as the duo try to defend their title.