Rahm finished tied for 27th place in his first Masters and then finished 4th in the Wells Fargo Championship and joint runner-up in the Dean & DeLuca Invitational, results which lifted him into the top-10 of the World Rankings. Making his debut in a European Tour event, he finished tied for 10th in the Open de France and, the following week, he earned his first European Tour victory by winning the Dubai Duty Free Irish Open by six strokes.
CIMB Classic: Captured first career PGA TOUR event at the CIMB Classic in Malaysia in late-October. Playing in 39th career PGA TOUR event, entered the final round tied with Brendan Steele at the top of the leaderboard after opening 68-61-67. Second-round 61 matched career low (2015 Sony Open, Round 2). Overcame a double bogey on the 14th hole on Sunday, responding with three consecutive birdies on Nos. 15-17 to post a 6-under-par 66 and win by one stroke over Adam Scott, becoming the youngest winner of the event at the age of 22 years, 6 months and 3 days. Also marked fourth consecutive winner on TOUR under the age of 24 dating back to the 2015 TOUR Championship (Jordan Spieth).
Sentry Tournament of Champions: Defeated Patrick Reed and Xander Schauffele in a playoff to win the Sentry Tournament of Champions for the second time, earning his 12th PGA TOUR title at age 26 years, 251 days. Became the third player since 1960 to win 12 times before turning 27, joining Jack Nicklaus and Tiger Woods. Represented his third win in a six-start stretch on TOUR. Joined Stuart Appleby (3), Geoff Ogilvy (2) and Dustin Johnson (2) as players to win the event multiple times since it moved to The Plantation Course at Kapalua in 1999. Led the field in Birdies (24) and Par-3 Scoring Average (2.75). Improved to 3-1 in his career in playoffs.
Season highlighted by three wins and a seventh-place finish in his FedExCup title defense. Made the cut in 21 of 23 starts, earning double-digit top-10s (10) for the second consecutive season and reaching 20 top-25s for the first time in his career. Became the first player since Tiger Woods in 2006 and 2007 to lead the TOUR in earnings in consecutive seasons. Accumulated a score of 155-under-par for the season, second-best on TOUR (Dustin Johnson, 189-under). Earned inaugural appearance on the United States Ryder Cup team.
BMW Masters: Finished second to Kristoffer Broberg in a sudden-death playoff at the BMW Masters in Shanghai. Opened with rounds of 71-69-64 and took a one-shot lead on the back nine on Sunday with an eagle out of a bunker on No. 15 followed by a birdie on No. 16. After a bogey on No. 17, finished with a par for a final-round 71 and a 271 total to match Broberg. In the playoff, the Swede drained a 15-foot birdie putt on the first extra hole to claim his first European Tour title.
Prior to his sophomore year, Schauffele transferred to San Diego State University, where eventually he would play out his college career and graduate in 2015. During his three years at SDSU, Schauffele was a Ping and Golfweek Third Team All-American. Scholastically, he was twice awarded the Mountain West Conference All-Academic Team Award. At SDSU, he holds the records for all-time lowest tournament score against par (−17); all-time career scoring average (71.50); as well as the seasonal records for par-5 performance (4.5135); birdies (171) and eagles (9).
Schauffele joined the 2018 European Tour as an associate member. With his win at the 2018 WGC-HSBC Champions, Schauffele rose in the European Tour's Order of Merit, the year long points race dubbed the European Tour Race to Dubai, to 4th position. Schauffele entered the European Tour final event, the DP World Tour Championship, Dubai, in 5th position. With a final round score of 6-under-par 66, which equaled the lowest score of the day, Schauffele finished T16. This ensured a season-ending 4th position on the Order of Merit and participation in the 2018 European Tour's bonus pool.
Dell Technologies Championship: After opening the Dell Technologies Championship with an even-par 71, closed with rounds of 67-69-66 to finish T6 and six strokes behind champion Justin Thomas. Has now finished inside the top six in his last three starts at TPC Boston (T4-2015, T5-2016, T6-2017). With his fourth top-10 finish of the season, moved to No. 22 in the FedExCup standings.
After a solid first season on the Web.com Tour, Xander finished in 26th position at the end of regular season play, a mere US$ 900.00 short of earning a PGA Tour card. In the ensuing Web.com Playoffs Xander did finish in 15th position securing his privileges for PGA Tour membership the hard way. Xander finished his first PGA Tour season with a solid run beginning with a T5 at the 2017 US Open and ending with being the first ever rookie to win the PGA Tour Championship. His 2-win season (2017 Greenbrier Classic; 2017 Tour Championship) earned Xander the Rookie of the Year award for the 2016-2017 season.
PGA TOUR rookie claimed seven top-10 finishes in 27 starts to earn a berth into the FedExCup Playoffs. At the BMW Championship, the third of four Playoffs events, finished T13 at Conway Farms GC, but came up just five points shy of finishing 30th in the FedExCup standings and moving on to the TOUR Championship by Coca-Cola. Ended the season ranked 32nd in the FedExCup standings.
It was no surprise, then, that Reed drew a poor lie in an indentation in the sand. What was surprising was what happened next: Reed took two practice swings that would face significant scrutiny over the coming hours. On the first practice swing, he placed his club on the sand behind his ball, took it club low and away, and scraped a quantity of sand from behind his ball. His second practice swing was slightly more square to the target, and as he pulled the club away he scraped an additional bit of sand out of the way. It looked pretty cut-and-dry: there had been sand in the way, and Reed cleared a path.
Reed told Crouse "For somebody as successful in the Ryder Cup as I am, I don't think it's smart to sit me twice." Reed implied that Tiger Woods was his "second choice". He told Crouse that after he and Woods lost their first match against Tommy Fleetwood and Francesco Molinari, Woods apologized to Reed for letting him down. Reed said he told Woods, "We win together as a team and we lose together as a team." Reed told Crouse that "very day [in the team room], I saw 'Leave your egos at the door,'". Referring to the Europeans, he added, "They do that better than us." There has been concern expressed that Reed's public flaming of his teammates and captain will negatively impact on his ability to play on future Ryder Cup and President Cup teams.
He won the Mark H. McCormack Medal in 2015 as the leading player in the World Amateur Golf Ranking, which qualified him for the following year's U.S. Open and Open Championship. He closed out his collegiate career by winning the Pac-12 Conference championship and an NCAA regional championship before finishing tied for third in the national championship. He was the low amateur at the 2016 U.S. Open, finishing his final tournament as an amateur in a tie for 23rd place at 7-over-par.
Deutsche Bank Championship: Making his third career start at the Deutsche Bank Championship, carded matching middle rounds of 4-under 67 and a final-round, 1-under 70 to T4, seven strokes behind Rickie Fowler. The finish marked his fourth top-10 of the season but first since a playoff loss in March at the Valspar Championship. Later finished T28 at the BMW Championship.