World Golf Championships-American Express Championship: With victory at the World Golf Championships-American Express Championship, became the first player in TOUR history to win five times in five consecutive seasons. Captured his record fifth consecutive Byron Nelson Award and the PGA of America's Vardon Trophy, based on each player's adjusted scoring average. Finished the season with an adjusted scoring average of 68.41, the second-lowest in TOUR history.
Ryder Cup: Was selected as a captain's pick for the United States in the Ryder Cup and made his eighth start in the biennial team event. Played in his first Ryder Cup since 2012 and failed to score any points for the U.S. in four matches played. Lost 2 and 1 to Jon Rahm in Singles as the Europeans regained the Ryder Cup with a 17.5-10.5 victory over the United States at Le Golf National in Paris, France.
On February 5, 2015, Woods withdrew from the Farmers Insurance Open after another back injury. Woods stated on his website that it was unrelated to his previous surgery and he would take a break from golf until his back healed. He returned for the Masters, finishing in a tie for 17th. In the final round, Woods injured his wrist after his club hit a tree root. He later stated that a bone popped out of his wrist, but he adjusted it back into place and finished the round. Woods then missed the cut at the 2015 U.S. Open and Open Championship, the first time Woods missed the cut at consecutive majors, finishing near the bottom of the leaderboard both times. He finished tied for 18th at the Quicken Loans National on August 2. In late August 2015, Woods played quite well at the Wyndham Championship finishing the tournament at 13-under, only four strokes behind the winner, and tied for 10th place. Woods offered only a brief comment on the speculation that he was still recovering from back surgery, saying it was "just my hip" but offering no specifics.
On December 2, following Us Weekly's previous day reporting of a purported mistress and subsequent release of a voicemail message allegedly left by Woods for the woman, Woods released a further statement. He admitted transgressions and apologized to "all of those who have supported [him] over the years", while reiterating his and his family's right to privacy. Over the next few days, more than a dozen women claimed in various media outlets to have had affairs with Woods. On December 11, he released a third statement admitting to infidelity and he apologized again. He also announced that he would be taking "an indefinite break from professional golf."
Ford Championship at Doral: Took over as World No. 1 for the first time since the week of Aug. 30, 2004 by defeating Phil Mickelson by a stroke at the Ford Championship at Doral. Paired with Mickelson in the final round for just the third time in his career, began the day two strokes behind. Caught up to Mickelson at the turn and took a two-stroke lead after an eagle on the par-5 12th hole. Mickelson birdied the next two and both bogeyed the 16th to remain tied with two holes to play. Birdied the 17th hole and when Mickelson's chip on No. 18 lipped out, earned the 42nd victory of his career.
THE TOUR Championship presented by Coca-Cola: Entered the TOUR Championship No. 1 in the FedExCup standings and romped for his seventh victory of the season by eight over Mark Calcavecchia and Zach Johnson with rounds of 64-63-64-66–257 and captured the first FedExCup. Season earnings were a career-best $10,867,052. First player to win the TOUR Championship multiple times.