Phil Mickelson survived a playoff showdown Sunday against the hottest player of the weekend at the World Golf Championship-Mexico Championship in Mexico City to grab his first win in over four years.
Mickelson shot par on the first playoff hole to defeat Justin Thomas, whose eagle on 18 gave him the clubhouse lead at 16 under and tied a PGA Tour record for final 36-hole score in relation to par (also 16 under).
Stuart Appleby set the record at the 2010 Greenbrier Classic.
Thomas shot a 7-under 64 on Sunday and a 9-under 62 the day before after rounds of 72 and 70 to open the tournament.
But Mickelson birdied Nos. 15 and 16 to tie Thomas, then followed with pars on Nos. 17 and 18 to force the playoff.
For Mickelson, who shot a 5-under 66 in the final round, it was his first victory since winning the 2013 British Open.
"I don't know what to say. It's been a tough go the last four years, not playing my best, but to have the belief that I was going to get there and finally break through and do it feels incredible. I believe that more is to come," a relieved Mickelson said.
"I try to look calm on the outside, but on the inside I'm shaking and I enjoy that; that's what was so fun, and that nervousness starting the round, before the round and all the preparation, all those nerves that you feel, I haven't felt that in a long time because I haven't been in the last group in a long time, and so it's been really fun."
Phil Mickelson throughout his career
Phil Mickelson throughout his career
CHARLOTTE, NC - MAY 14: Phil Mickelson yells four after teeing off on the 16th hole during round one at the Wells Fargo Championship at Quail Hollow Club on May 14, 2015 in Charlotte, North Carolina. (Photo by Jeff Gross/Getty Images)
Phil Mickelson watches the ball fly during a NCAA golfing event.
21 Feb 1993: Phil Mickelson lines up a putt during the 1993 Buick Invitational at the Torrey Pines Golf Course in Torrey Pines, California. Mandatory Credit: Gary Newkirk /Allsport
24 Feb 1995: Phil Mickelson looks on during the Nissan Los Angeles Open at the Riviera Country Club in Los Angeles, California.
27 Jan 1996: Phil Mickelson of the USA drives at the 17th hole during the final round of the Phoenix Open at the TPC of Scottsdale in Scottsdale, Arizona. Mickelson defeated Justin Leonard in a three-hole playoff. Mandatory Credit: Simon P. Barnett/Alls
9 Feb 1996: Golfer Phil Mickelson takes to the green during competition at the Buick Invitational at Torrey Pines Golf Course in La Jolla, CaliforniaCalifornia. Mickelson finished 17 under par for a 271. Davis Love III won the tournament by two strokes
8 Feb 1996: Phil Mickelson swings at the ball during the Buick Invitational in San Diego, California.
31 Jan 1998: Phil Mickelson during the AT&T National Pro-Am at Spyglass Golf Course in Pebble Beach, California. Mandatory Credit: Craig Jones /Allsport
23 Aug 1997: Phil Mickelson hugs Amy Mickelson at the NEC World Series of Golf at the Firestone Country Club in Akron, Ohio. Greg Norman went on to win the tournament.
10 Apr 1999: Phil Mickelson of the USA plays out the bunker during the 1999 US Masters at the Augusta National GC in Augusta, Georgia, USA. \ Mandatory Credit: Craig Jones /Allsport
18 Aug 2000: Phil Mickelson follows his drive during the PGA Championship, part of the PGA Tour at the Valhalla Golf Club in Louisville, Kentucky.Mandatory Credit: Andy Lyons /Allsport
25 Jan 2001: A silhouette of a golfer during the Phoenix open at the TPC Scottsdale in Scottsdale, Arizona.Mandatory Credit: Jon Ferrey /Allsport
8 Apr 2001: Phil Mickelson of the USA lines up a putt on the 4th green during the final day of the 2001 Masters at the Augusta National Golf Club, Augusta, GA, USA.....DIGITAL IMAGE. Mandatory Credit: Stephen Munday/ALLSPORT
15 Jun 2001: Phil Mickelson hits a long drive during the 101st US Open at the Southern Hills Country Club in Tulsa, Oklahoma.Mandatory Credit: Jamie Squire /Allsport
29 Nov 2001: Phil Mickelson plays golf at Whisper Rock, a course that he designed in Scottsdale, Arizona. Mandatory Credit: Scott Halleran/Getty Images
HILTON HEAD ISLAND, SC - APRIL 20: Phil Mickelson pulls a club during the third round of the WorldCom Classic at Harbour Town GL in Hilton Head Island, South Carolina on April 19, 2002. (Photo by Craig Jones/Getty Images)
GULLANE, SCOTLAND - JULY 16: Phil Mickelson of the USA waits to play his shot during the practice round for the 131st Open Championships at Muirfield Golf Club, Gullane, Scotland on July 16, 2002. (Photo by Andrew Redington/Getty Images)
THOMASTOWN - 19 SEPTEMBER: Phil Mickelson of the USA hits his approach to the second green during the first round of the World Golf Championships: American Express Championship at Mount Juliet Estate in Thomastown, Kilkenny, Ireland on September 19, 2002. (photo by Andrew Redington/Getty Images)
PUERTO VALLARTA, MEXICO - DECEMBER 14: (L-R) Phil Mickelson of USA celebrates his birdie on the 1st hole with David Toms of USA during the third round of the EMC World Cup at the Vista Vallarta Club de Golf on December 14, 2002 in Puerto Vallarta, Mexico. (Photo by Harry How/Getty Images)
OLYMPIA FIELDS, IL - JUNE 13: Phil Mickelson reacts to a missed putt during the second round of the 2003 US Open on the North Course at the Olympia Fields Country Club on June 13, 2003, Olympia Fields, Illinois. (Photo by Ross Kinnaird/Getty Images)
SANDWICH, ENGLAND - JULY 17: Phil Mickelson of the USA plays out from a bunker on the 16th hole during the first round of the Open Championship at the Royal St George's course on July 17, 2003 in Sandwich, England. (Photo by Ross Kinnaird/Getty Images)
AUGUSTA, UNITED STATES: Phil Mickelson (L) of the US receives the green jacket from 2003 Champion Mike Weir (R) of Canada at the awards ceremony after Mickelson made the birdie putt the 18th green during the final round of the Masters Golf Tournament 11 April 2004 at Augusta National Golf Club in Augusta, GA. Mickelson won the tournament at nine under par. AFP PHOTO/Timothy A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Phil Mickelson checks the wind at Whistling Straits, site of the 86th PGA Championship in Haven, Wisconsin August 12, 2004. (Photo by A. Messerschmidt/Getty Images)
UNITED STATES - FEBRUARY 13: Phil Mickelson during the final round of the 2005 AT&T Pebble Beach National Pro-Am at Pebble Beach Golf Club in Pebble Beach, California on February 13, 2005. Mickelson won the event by four strokes at -19 par. (Photo by Mike Ehrmann/Getty Images)
MAMARONECK, NY - JUNE 15: Phil Mickelson hits a tee shot on the 15th hole during the first round of the 2006 US Open Championship at Winged Foot Golf Club on June 15, 2006 in Mamaroneck, New York. (Photo by Nick Laham/Getty Images)
AUGUSTA, GA - APRIL 09: Phil Mickelson is presented the green jacket by Tiger Woods after his 7-under par victory during the Final Round of The Masters at the Augusta National Golf Club on April 9, 2006 in Augusta, Georgia. (Photo by Getty Images)
STRAFFAN, IRELAND - AUGUST 28: Phil Mickelson of the USA speaks to the press during a USA Team Practice prior to the 2006 Ryder Cup at The K Club on August 28, 2006 in Straffan, Co. Kildare, Ireland. (Photo by Ian Walton/Getty Images)
PONTE VEDRA BEACH, FL - MAY 13: Phil Mickelson of the USA holds the trophy after the final round of THE PLAYERS held on the Stadium Course at The TPC Sawgrass, on May 13, 2007 in Ponte Vedra Beach, Florida. (Photo by David Cannon/Getty Images)
SINGAPORE - NOVEMBER 15: Phil Mickelson of USA in action during the 3rd round of the Barclays Singapore Open at Sentosa Golf Club on November 15, 2008 in Singapore. (Photo by Ian Walton/Getty Images)
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England's Tyrrell Hatton finished in a career-best tie for third at 15 under.
Dustin Johnson and Spaniard Sergio Garcia finished tied for seventh at 12 under, while Bubba Watson headlined a trio tied for ninth at 10 under.
Shubhankar Sharma, a 21-year-old from India, was atop the leaderboard to start the day, but shot 3-over 74 to put him at 10 under for the tournament and in the group tied for ninth.