India's Anirban Lahiri was unable to build on his gains in the previous rounds to finish tied 53rd at the Charles Schwab Challenge here.
Lahiri, who is still some way from making his place in the Tour Championships safe will be back this week for the Memorial Championships hosted by Jack Nicklaus.
Lahiri, who shot 68, 71, 72 and 73 finished at four-over 284.
Kevin Na, the South Korean-born American birdied four of the first eight holes and shot a 4-under 66 for a four-shot victory over Tony Finau at the course made famous by Ben Hogan. It was his third career PGA TOUR win and second in 10 months.
Na opened with a two-shot lead and was in front by at least that many for the final 16 holes after putting his second shot inside 5 feet for birdie at the par-4 second. Na finished 13 under after a bow-tying birdie at 18.
Na put himself in contention with a second-round 62, one off the Colonial record.
Local favorite Jordan Spieth's putting failed him on final day and he carded 2-over 72 to finish eight shots back and remained without a victory since the 2017 Open Championship.