[22] In 2012, after failing to advance to the Final Stage of PGA Tour qualifying school,[23] 19-year-old Spieth turned professional midway through his sophomore year at Texas.

[citation needed] In the 2013 season, Spieth played in his first tournament in January, where he missed the cut by two strokes at the Farmers Insurance Open at Torrey Pines.

[7] On July 14 (about two weeks before his 20th birthday) Spieth won the John Deere Classic on the fifth hole of a three-way, sudden-death playoff against defending champion Zach Johnson and David Hearn.

[27][28] With the victory, Spieth was granted full status as a PGA Tour member and became eligible for the FedEx Cup, entering in 11th place in the standings.

During the final round, Spieth at one point was the stand-alone leader by two strokes and in position to become the youngest Masters champion in history; Tiger Woods holds the record at age 21.

[34] Following the PGA Championship, Spieth earned selection to the 2014 Ryder Cup team, becoming the youngest American to play in the matches for 85 years since Horton Smith in 1929.

[35] In November, Spieth won his second tournament as a professional at the Emirates Australian Open on the PGA Tour of Australasia; in the final round he shot a course-record 63 to win the title by six strokes.

[48] The other four golfers to accomplish this feat are Hall of Fame members Craig Wood, Ben Hogan, Arnold Palmer, and Jack Nicklaus.

[54] Spieth started the year when he won the Hyundai Tournament of Champions with a dominant display that saw him race to an eight stroke victory over Patrick Reed.

[62] Three-time Masters winner Nick Faldo, who won the 1996 tournament, said that Spieth's collapse "made Norman's feel like a joyful stroll down Magnolia Lane".

After finishing 4th alongside Ryan Palmer at the Zurich Classic, Spieth missed consecutive cuts at the Players Championship and the AT&T Byron Nelson.

A return to form came at the Dean & DeLuca Invitational, where Spieth narrowly missed out on successfully defending his title, finishing a shot behind eventual winner Kevin Kisner.

Spieth finished with a final round 69 — three strokes clear of Kuchar, who also carded a 69 – and became just the second player in history after Jack Nicklaus to win three of the four men's golf majors before his 24th birthday.

[70] After finishing in a tie for 13th at the WGC-Bridgestone Invitational, Spieth headed to the final major of the year, the PGA Championship, with the opportunity to become the sixth man in history to win the career grand slam.

Spieth headed into the season-ending Tour Championship at East Lake knowing victory would guarantee him his second FedEx Cup title in three years.

For the second consecutive year, Spieth began his season by competing in both tournaments during the Hawaii swing, finishing 9th at the Sentry Tournament of Champions and in a tie for 18th at the Sony Open in Hawaii (he would make the longest putt of his career (90'8") during the second round), before missing the cut at the Phoenix Open and finishing in a tie for 20th as the defending champion at the AT&T Pebble Beach Pro-Am.

In February, Spieth was announced as the PGA Tour's Chairman of the Player Advisory Council, succeeding Davis Love III.

A month away from the Masters Tournament, Spieth was hoping to kick-start his season at the Valspar Championship, where he was victorious in 2015, which led on to his magnificent year with his win at Augusta, as well as the U.S. Open.

He was victorious over Charl Schwartzel and Li Haotong, but was defeated by Ryder Cup playing partner Patrick Reed in their winner-takes-all final match, which meant Spieth failed to progress out of the group stage.

Spieth played in all five sessions of the Ryder Cup, collecting three points alongside Justin Thomas, but Europe would regain the trophy in Paris.

He then missed the cut at the Mayakoba Golf Classic, meaning for the first time in his professional career, Spieth had gone an entire calendar year without a victory worldwide.

A tie for 45th followed at the AT&T Pebble Beach Pro-Am; Spieth had been a shot off the lead at the halfway point, but over-par rounds over the weekend saw him fall down the leaderboard.

For the fourth time in five years, Spieth missed the cut at the Players Championship, before exiting in the round robin stages at the WGC-Dell Technologies Match Play and then finishing in a tie for 30th at the Valero Texas Open.

It was not to be the beginning of a return to form as poor results followed and at the end of January, after finishing tied for 55th place in the Farmers Insurance Open, he fell outside the top 50 in the world rankings for the first time since his first season on tour.

[74] In June 2020, Spieth finished tied for 10th at the Charles Schwab Challenge at Colonial Country Club in Fort Worth, Texas, after maintaining a lead for most of the third round.

During the third round of the AT&T Pebble Beach Pro-Am in February 2022, Spieth hit an approach shot on the eighth hole standing inches from the edge of a cliff.

[citation needed] On April 17, 2022, Spieth won his 13th PGA Tour title, when he achieved victory at the RBC Heritage, defeating Patrick Cantlay in a playoff having overturned a 3 stroke deficit to third round leader, Harold Varner III.

[80] In September 2023, Spieth played on the U.S. team in the 2023 Ryder Cup at Marco Simone Golf and Country Club in Guidonia, Rome, Italy.

The Foundation provides awareness and financial assistance to community organizations in four philanthropic groups: special needs children, military families, junior golf and pediatric cancer.

1Cancelled due to COVID-19 pandemic QF, R16, R32, R64 = Round in which player lost in match play NT = No tournament "T" = Tied Note that the Championship and Invitational were discontinued from 2022.