|Valspar Championship final-round leaderboard|
|-10 Spieth*, Reed, O'Hair (US), -9 Stenson (Swe); -8 Moore (US); -6 Merritt (US). Selected others: -4 Davis (Eng); -3 Westwood (Eng); -2 Poulter (Eng); -1 Laird, Knox (Sco) *winner at third play-off hole|
Jordan Spieth beat fellow Americans Patrick Reed and Sean O'Hair in a play-off to win the Valspar Championship.
The trio finished on 10 under par, one shot ahead of Sweden's Henrik Stenson.
Spieth, 21, who claimed victory in Florida with a birdie on the third play-off hole, becomes the fourth player in the last 70 years to win two PGA tour titles before the age of 22.
England's Brian Davis shot a final-round two-under 69 to finish on four under, in joint 10th position.
Spieth (69) saved par on his final three holes to scramble his way into the play-off, while Reed (66) holed a 30-foot birdie putt to secure his place.
O'Hair (67), ranked 401st in the world and looking for a first win since 2011, was denied victory when his 12-foot birdie putt on the second play-off hole caught the lip.
The challenge of overnight third-round leader Ryan Moore (72) ended when he bogeyed two of the final three holes to finish eight under.
Lee Westwood (69) finished on three under, with Ian Poulter (69) a further shot behind.
It is only the second time in 50 years that the tournament has been decided by a play-off. Luke Donald won the other, when he claimed victory in 2012.