Fowler, who started the final round with a two-shot lead as he tried to end nearly three years without a victory, faded with a pair of three-putts and shot 71 to tie for third.
Rory McIlroy got up and down from a greenside bunker for par at No. 18 to shoot 72, having also saved par on the 17th after a wayward drive.
Count Rory McIlroy in when it comes to banning the books players use to help them read greens — even though he uses one himself.
Maybe it's just a coincidence that Rory McIlroy is right back in the thick of it at the Wells Fargo Championship.
Rory McIlroy fired an eight-under par 64 to finish 72 holes on 18-under 270 and defeat DeChambeau by three strokes.
Rory McIlroy has called for a limit on alcohol sales at US PGA Tour events to ease the effect of a growing number of hecklers at tournaments.
McIlroy is bracing for the bustle that comes with a Tiger Woods pairing, but said the chance to play with a golfer he still considers a hero is worth it.
Tiger Woods continues his comeback this week at Riviera Country Club, where he'll be paired with Rory McIlroy and Justin Thomas.
The 28-year-old from Northern Ireland, lacking only a victory at the Masters to complete a career Grand Slam, has bought the former home of South African four-time major winner Ernie Els.
Rory McIlroy set himself three challenging career goals as he plots his comeback in 2018 following an injury-hit and trophyless year.