At the 2017 Tour Championship, Schauffele birdied the 72nd hole to win by one stroke over Justin Thomas, becoming the first rookie ever to win the Tour Championship. Schauffele's win also marked the first time a rookie has won any FedEx Cup playoff event. The win moved Schauffele to third place in the final FedEx Cup standings, bettering the previous best mark by a rookie held by Jordan Spieth by four positions. The win moved Schauffele to 32nd in the Official World Golf Ranking, up 267 spots from his 2016 year-end finish of No. 299, and gave him a three-year PGA Tour exemption through the 2019–20 season. Schauffele was voted "Rookie of the Year 2017" by his peers on October 2, 2017. He is the fourth member of the high school class of 2011 to earn PGA Tour Rookie of the Year honors, joining Jordan Spieth (2013), Daniel Berger (2015) and Emiliano Grillo (2016).
But then he stepped into the scoring area and stayed there for a number of minutes. Woodland emerged and headed to Golf Channel’s stand-up area to give post-round comments. Reed started to walk out of the scoring area but then was called back in by Slugger White. After another minute, he emerged. A PGA Tour staffer spoke to Reed, who said he would be declining to give an interview on Golf Channel or give official remarks to reporters at the podium. But as a group of reporters looked on, Reed motioned them over and said he was happy to discuss what had happened.
Reed has not spoken to his parents Bill and Jeannette Reed or his younger sister Hannah since he married Justine in 2012. Reed did not invite his parents or his sister to his wedding and only considers Justine's family close. Reed's family has continued to attend tournaments where he played, even after Reed asked security to escort them out of the 2014 U.S. Open.
On January 12, Reed won his fourth PGA Tour title at the Hyundai Tournament of Champions by defeating Jimmy Walker in a sudden death playoff. He became just the fourth player in the last two decades to win four times on the PGA Tour before his 25th birthday, the other three were Tiger Woods, Rory McIlroy, and Sergio García. The win moved Reed to a career-best OWGR ranking of 14th. Also, he finished second at the Valspar Championship, third at the Hero World Challenge, and seventh at the Honda Classic. Reed also joined the European Tour for the 2015 season.
Safeway Open: In the season-opening Safeway Open, overcame a 3-over 75 in round one with scores of 66-66-67 to finish T8 with four others at 14-under 274. Marked his second consecutive top-10 in the event having finished T3 in 2015. Before play began, announced that he would be donating $250 for every birdie or eagle made in his first three events of the 2016-17 PGA TOUR season to Convoy of Hope, a disaster-response, non-profit organization providing aid to those impacted by Hurricane Matthew which brought devastation to Haiti, the Bahamas and the southeastern United States. At the Safeway Open, made 23 birdies and one eagle, totaling $6,000 in donations.
Thomas turned professional in 2013 and earned his tour card on the Web.com Tour through qualifying school. He won his first professional event at the 2014 Nationwide Children's Hospital Championship. Thomas finished fifth in the 2014 Web.com Tour regular season, and third after the Web.com Tour Finals, and earned his PGA Tour card for the 2015 season. In 2015, Thomas collected seven top-10s and 15 top-25s, with fourth-place finishes at the Quicken Loans National and Sanderson Farms Championship as his best results. He finished 32nd at the PGA Tour's FedEx Cup, losing the Rookie of the Year award to Daniel Berger.
On January 6, 2019, Schauffele won the Sentry Tournament of Champions at The Plantation Course at Kapalua Resort in Maui, Hawaii. He shot 11-under-par 62 in the final round to pass Gary Woodland, who held a 5-shot lead on Schauffele entering the final round. Schauffele's final round 62 tied the course record at The Plantation Course. He is tied with K.J. Choi (2003), Graeme McDowell (2011), Chris Kirk (2015) and Jason Day (2015).
After turning professional in June 2015, Schauffele entered the 2015 Web.com Tour Qualifying Tournament in fall. He was runner up in first stage at Southern Dunes GC in Maricopa, Arizona. He went on to win second stage at Oak Valley GC in Beaumont, California and ultimately earned his Web.com Tour card in the finals in Florida in a tie for 40th.