World Golf Championships-Cadillac Championship: Posted a final-round, 6-under 66 to finish T10 at the World Golf Championships-Cadillac Championship, his first top-10 of the season and best showing since a T4 at the 2010 U.S. Open. It marked the 11th time in as many starts that he has finished with a top-10 at the event and the eighth time in as many starts inside the top 10 at the TPC Blue Monster at Doral. The showing represented his best round on TOUR since a second-round, 6-under 65 at the 2010 Deutsche Bank Championship. Played the first three rounds with Phil Mickelson, the first time the two have been paired together for three rounds in a PGA TOUR-sanctioned event. The two have had 28 official pairings on TOUR and 29 counting the 2009 World Golf Championships-HSBC Champions.
Earned his 80th PGA TOUR victory and first since 2013, winning the TOUR Championship for the third time in his career to move within two of Sam Snead's TOUR-best 82 victories. Finished the season No. 2 in the FedExCup, with runner-up finishes at the Valspar Championship and PGA Championship among his seven top-10s. Led the TOUR in Strokes Gained: Approach the Green (0.938) for the sixth consecutive season in which he played the minimum number of rounds. After originally being selected as a Captain's Assistant for the United States Ryder Cup team, was later selected as a captain's pick and played in the event for the eighth time.