The Open Championship (146th) (July 20-23) (first time prize money awarded in US dollars). Second-placed Matt Kuchar (USA) finished 3 shots behind Spieth (USA), who at age 23 yrs 11 mths 26 days became the second youngest player to win three different men's major championship titles (Jack Nicklaus achieved this feat aged 23 yrs 6 mths). In the third round Branden Grace (RSA) recorded the first ever score of 62 for a single round in a men's major championship. [Royal Birkdale GC, Southport, Merseyside].

Spieth (USA) won the PGA of America Vardon Trophy, recording the season's lowest adjusted scoring average on the PGA Tour (over a minimum of 60 rounds). Rickie Fowler (USA) was second with 69.083; Justin Thomas (USA) was third with 69.359.

Spieth (USA) won the PGA Tour Byron Nelson Award, recording the season's lowest scoring average (over a minimum of 50 rounds). Rickie Fowler (USA) was second with 69.08; Justin Thomas (USA) was third with 69.36.

Played as the AT&T Pebble Beach National Pro-Am (Feb 9-12). Second-placed Kelly Kraft (USA) finished 4 shots behind 23-year-old Spieth (USA), who recorded his ninth PGA Tour win. [Pebble Beach Links, Monterey Peninsula, CA. Earlier rounds also at: Monterey Peninsula CC (Shore course) and Spyglass Hill GC].

Played as the Travelers Championship (June 22-25). Spieth (USA) holed-out for birdie from a greenside bunker to beat Daniel Berger (USA) at the first playoff hole (par-4 18th). [TPC River Highlands, Cromwell, CT].

Played as the Hyundai Tournament of Champions (Jan 7-10; first PGA Tr event of 2016; PGA Tr 2015/16 season). Defending champion and second-placed Patrick Reed (USA) finished 8 shots behind Spieth (USA), who claimed his seventh PGA Tour win. [Plantation course, Kapalua Resort, Maui, Hawaii].

Played as the Dean & Deluca Invitational (May 26-29; formerly Crowne Plaza Invitational). Second-placed Harris English (USA) finished 3 shots behind Spieth (USA). Spieth shot a back-nine 30 on the final day to win for the first time in his home state of Texas. [Colonial CC, Ft Worth, TX].

Played as the Emirates Australian Open (Nov 17-20; Aus/OneAsia Trs event). Spieth (USA) beat Cameron Smith (Aus) and Ashley Hall (Aus) with a birdie at the first playoff hole (par-4 18th) to win this event for the second time in three years. [Royal Sydney GC, Rose Bay, Sydney, Aus].

Spieth (USA) won the PGA Tour Byron Nelson Award, recording the season's lowest scoring average (over a minimum of 50 rounds). Jason Day (Aus) was second with 69.161; Bubba Watson (USA) was third with 69.296.

Played as the Tour Championship by Coca-Cola (Sept 24-27; last of four FedExCup playoff events). Second-placed Henrik Stenson (Swe), Justin Rose (Eng) and Danny Lee (NZ) finished 4 shots behind Spieth (USA). 22-year-old Spieth gained enough points to win the season-long FedEx Cup and associated $10 million bonus; he also regained the No.1 spot on the official world golf rankings. [East Lake GC, Atlanta, GA].

Played as the Valspar Championship (March 12-15). Spieth (USA) beat Patrick Reed (USA) and Sean O'Hair (USA) with a birdie at the third playoff hole. [Copperhead course, Innisbrook Resort, Palm Harbor, nr Tampa, FL].

22-year-old Spieth (USA) won the PGA Tour season-long points chase, to capture the FedExCup and $10 million bonus. Henrik Stenson (Swe) was second with 2,307 pts; Jason Day (Aus) was third with 2,290 pts. The Cup is awarded based on points earned during the regular PGA Tour season and in the four playoff events.

Spieth (USA) won the PGA of America Vardon Trophy, recording the season's lowest adjusted scoring average on the PGA Tour (over a minimum of 60 rounds). Jason Day (Aus) was second with 69.161; Bubba Watson (USA) was third with 69.296.

Spieth (USA) won the Arnold Palmer Award as the PGA Tour 2015 leading money winner, with earnings of $12,030,465 on the Tour. Jason Day (Aus) was second with $9,403,330; Bubba Watson (USA) was third with $6,876,797.

Spieth (USA) won the PGA of America Player of the Year Award (based on points allocated for PGA Tour wins, money list position and scoring average). Spieth accumulated 180 pts; Bubba Watson (USA) was second with 52 pts; Zach Johnson (USA) was third with 46 pts.

Spieth (USA) won the Jack Nicklaus Award as the PGA Tour Player of the Year, based on the votes of his peers.

The Masters Tournament (79th) (April 9-12). Second-placed Justin Rose (Eng) and Phil Mickelson (USA) finished 4 shots behind wire-to-wire winner Spieth (USA). In winning his first major championship, 21-year-old Spieth broke or equalled many Masters records, including: lowest Masters winning score of 18-under par 270 (also achieved by Tiger Woods, 1997); first player to reach 19-under (a bogey at the 72nd hole cost him the outright lowest score record); second youngest winner (5 months behind Tiger Woods, 1997); 28 birdies over the four rounds, breaking Mickelson's record of 25 in 2001. [Augusta National GC, Augusta, GA].

The US Open (115th) (June 18-21). Second-placed Dustin Johnson (USA) and Louis Oosthuizen (RSA) finished 1 shot behind Spieth (USA), who claimed back-to-back major championships, having won The Masters earlier in the year. [Chambers Bay Golf Course, University Pl, nr Seattle, WA].

Played as the John Deere Classic (July 9-12). Spieth (USA) beat Tom Gillis (USA) with a par at the second playoff hole (par-4 18th). [TPC Deere Run, Silvis, IL].

Played as the Hero World Challenge (Dec 4-7; unofficial PGA Tour money event, hosted by Tiger Woods). Second-placed Henrik Stenson (Swe) finished 10 shots behind wire-to-wire winner Spieth (USA). A week earlier Spieth also won the Australian Open. [Isleworth G&CC, Orlando, FL].

Played as the Emirates Australian Open (Nov 27-30; Aus/OneAsia Trs event). Second-placed Rod Pampling (Aus) finished 6 shots behind Spieth (USA), who recorded his second professional win, and first outside the USA. [The Australian GC, Rosebery, Sydney, Aus].

Played as the John Deere Classic (July 11-14). 19-year old Spieth (USA) beat Zach Johnson (USA) and David Hearn (Can) with a par at the fifth playoff hole. Spieth became the first teenage winner of a PGA Tour event for 82 years, when Ralph Guldahl won the 1931 Santa Monica Open. [TPC Deere Run, Silvis, IL].

Spieth (USA) won the PGA Tour 2013 Rookie of the Year Award as the leading first-season player. He finished 10th on the Tour's money list, with earnings of $3,879,820 on the Tour.

Played as the U.S. Junior Amateur Championship. Spieth (USA) beat Chelso Barrett (USA) 6 and 5 in the final to win this event for the second time in three years. [Olympic course, Gold Mtn GC, Bremerton, WA].

Played as the U.S. Junior Amateur Championship. Spieth (USA) beat Jay Hwang (USA) 4 and 3 in the final. [Old and New courses, Trump Natl GC, Bedminster, New Jersey].