Lahiri, who had been missing putts from makeable distances through the week, had three birdies, four bogeys and one double on the 18th, for which he was five-over for the week. His total was two-under 288 and he ended tied-61st.
William McGirt won for the first time in 165 starts on the PGA Tour, and the timing could not have been better.
McGirt played the final 22 holes of the tournament without a bogey, and his 6-foot par on the second extra hole to beat Jon Curran, earned him a handshake from host Jack Nicklaus and he moved high enough in the World Golf Ranking to number 43 to get into the U S Open in two weeks at Oakmont.
Jordan Spieth at three-under 285 was Tied-57, while World No. 1 Jason Day (74) was nine-under 279 and tied-27th.
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Curran showed his mettle, too, hitting out of a fairway bunker on the 17th hole to 7 feet for a birdie that carried him to a 70.