Those late birdies boosted Spieth to a 6-under 65 and got him in at 19-under 265. David Hearn closed with a 69 and 2012 winner Zach Johnson carded a 68 in the final round to also end at minus-19.
Spieth escaped on the fifth playoff hole after Hearn and Johnson had their chances over the first four extra holes. Johnson nearly chipped in for birdie and the win on the first extra hole, then he missed a birdie putt the second time they played the 18th.
The trio moved to the par-3 16th, and Hearn had a chance to win, but he missed a 15-foot birdie chance. Hearn again missed a birdie effort, this time from five feet out, on the par-5 17th.
The group headed back to the 18th for the fifth extra hole. Johnson found water with his second and all but eliminated himself. Spieth 2-putted for par from the back fringe and it was up to Hearn to extend the playoff, but he failed to make a 7-foot par putt.
Spieth became the first teenager to win on the PGA Tour since 1931. He will headline the field with Johnson and three-time winner Steve Stricker.
The field will also include amateur standouts Cameron Wilson, Bobby Wyatt and Jordan Niebrugge.
This week also marks the final event to qualify for the British Open. The top-5 finisher, who hasn't already qualified, will earn a spot at Hoylake.
Golf Channel has coverage on Thursday and Friday and early coverage on the weekend before CBS takes over for the remainder of the action.
The PGA Tour heads to England next week for the Open Championship, where Phil Mickelson will defend his title at Royal Liverpool Golf Club. Tiger Woods won the last time the Open was played at Royal Liverpool.
RICOH WOMEN'S BRITISH OPEN, Royal Birkdale Golf Club, Lancashire, United Kingdom - Stacy Lewis broke a string of 10 straight non-American winners in majors when she birdied the final two holes last year to win the Women's British Open.
Lewis joined Sherri Steinhauer as the only two American winners of the Women's British Open since it became a major championship. Lewis closed with an even- par 72 on the Old Course at St. Andrews
She not only stopped a streak of 10 straight non-American winners, but she also halted Inbee Park's march at history.
Park had won the first three majors last season. After starting the championship 6-under par through 10 holes, Park slowly fell back. She struggled to a 6-over 78 in the final round to end at 6-over 294.
The third round was completed on Sunday morning as strong wind halted play on Saturday. The last seven groups played a full 36 holes on Sunday.
Morgan Pressel led when the third round was completed, but she stumbled to a 4-over 76 in the final round and dropped into a tie for fourth.
Royal Birkdale is hosting the Women's British Open for a sixth time. Yani Tseng won the title in 2010 at Birkdale, while Jeong Jang won there in 2005.
ESPN will have coverage of all four rounds.
The LPGA Tour returns to the United States next week for the Marathon Classic. Beatriz Recari fired four rounds in the 60s, including a final-round 66 last year, to fend off Paula Creamer by one stroke. That event was played two weeks before the Women's British Open last year.
U.S. SENIOR OPEN CHAMPIONSHIP, Oak Tree National, Edmond, Oklahoma - The senior circuit is in Oklahoma this week for their fourth major of the season, the U.S. Senior Open.
Kenny Perry went 13-under par over the final two rounds at Omaha Country Club last year to roar from behind and win the U.S. Senior Open. He had trailed by two strokes heading into the final round, but fired a 63 to cruise to the victory.
The win for Perry was his second straight in a major championship as he had won the Senior Players Championship two weeks earlier.
He became the ninth Champions Tour player to win two straight major championships.
Michael Allen led by five after two rounds to set a new tournament mark for largest lead after 36 holes. However, he closed with back-to-back 2-over 72s to fall into fifth place.
Oak Tree National has hosted the 1984 U.S. Amateur, the 1988 PGA Championship and the 2006 Senior PGA Championship.
Scott Verplank, who is an Oak Tree member, turns 50 on Wednesday and will compete on the course at which he won the 1984 U.S. Amateur. He will play alongside the winners of the other two majors played at Oak Tree - 1988 PGA Champion Jeff Sluman and 2006 Senior PGA Champion Jay Haas.
ESPN2 will have coverage of the opening two rounds before handing off to NBC for the final two rounds.
After a week off, the Champions Tour heads to Wales for the Senior British Open at Royal Porthcawl Golf Club. Mark Wiebe was a playoff winner over Bernhard Langer on Monday morning last year. Langer made double-bogey on the final hole to fall into the playoff.
ABERDEEN ASSET MANAGEMENT SCOTTISH OPEN, Royal Aberdeen, Aberdeen, Scotland - Last year at Castle Stuart, Phil Mickelson picked up his first official European Tour win in dramatic fashion.
Mickelson, as he is wont to do, missed a 5-foot par putt on the final hole of regulation to force a playoff with Branden Grace. On the first extra hole, Mickelson blasted to within inches of the hole from the sand.
After Grace missed a 25-footer for birdie, Mickelson had the win as he already tapped in for birdie.
The pair both rallied past Henrik Stenson, who led entering the final round, but he bogeyed three of the last six holes to end two strokes back at minus-15.
Mickelson will have his hands full in his title defense this week as the field includes 23 of the top 60 players in the world rankings, 10 past major champions and eight former Scottish Open winners. Among that group are Rory McIlroy and Justin Rose.
The Tour heads to England next week for the Open Championship, where Mickelson will defend his title at Royal Liverpool Golf Club. Tiger Woods won the last time the Open was played there.
UTAH CHAMPIONSHIP, Willow Creek Golf Club, Sandy, Utah - Steven Alker returns to Utah this week to defend his title at Willow Creek Golf Club.
Alker closed with a 66 last year to join Ashley Hall at 22-under 262. Hall posted a 65 in the final round, and the pair went back to the par-3 18th for the first playoff hole.
Hall found water off the tee, but scrambled for a bogey. Alker rolled his birdie effort to four feet. After Hall tapped in for bogey, Alker drained his par putt for the win.
Those two weren't the whole story in the final round though. Will Wilcox fired the fourth 59 in Web.com Tour history. He shared second place with Ben Martin and Chad Collins, who shot 60 in round two.
Golf Channel has coverage of all four rounds.
The Web.com Tour moves to Idaho next week for the Albertsons Boise Open, where Kevin Tway was a playoff winner last year.
PGA TOUR CANADA
THE PLAYERS CUP, Pine Ridge Golf Club, Winnipeg, Manitoba - The PGA Tour Canada continues its schedule this week in Manitoba with The Players Cup.
Carlos Sainz, Jr. rallied with a 4-under 68 last year to win for the first time on Tour. He has moved on to the Web.com Tour and won't be on hand to defend his title.
The top-nine players from the Order of Merit are slated to be in the field this week, including two-time winner Joel Dahmen.
After a week off, the tour heads to Ontario for the Staal Foundation Open, which is a new event on the PGA Tour Canada schedule.