Harry Hall of England was unable to win his first PGA Tour triumph after Emiliano Grillo defeated Adam Schenk in a playoff to take home the Charles Schwab Challenge trophy.
Argentine Grillo and American Schenk each started the fourth round four strokes and one stroke behind Hall, respectively.
When Hall failed, the 30-year-old appeared to be on his way to victory but double-bogeyed 18 after driving into a stream, which caused his ball to go back in his direction. Grillo, though, rallied and beat Schenk with a birdie on the second playoff hole.
Grillo recorded a final-round two-under-par 68 to claim his second PGA Tour victory, although this one was his first since 2015.
Hall had a strong start to the day at the respected Colonial with back-to-back birdies on the opening two holes, but four bogeys caused his advantage to disappear. However, as he teed off on the last hole, the 25-year-old found himself in a three-way tie for first place with Grillo and Schenk.
He missed the play-off by one stroke, after hitting his tee shot into the water and making a closing bogey as he sought to win his first PGA Tour championship. He ended with a score of 73.
Hall and world number one Scottie Scheffler, who shot a three-under 67 and had a hole-in-one at the 189-yard eighth, tied for third place in Texas.