A quadruple bogey cost Jordan Spieth at the Sony Open in Hawaii as Chris Kirk and Zach Johnson shared a first-round lead.
Spieth, a three-time major champion, should have been close to the lead, only to finish with a one-under 69 in Honolulu on Thursday.
The American was four under with two holes to play, but he endured a nightmare on the par-four eighth.
Spieth's tee shot went left as the first of four consecutive shots that would hit trees as he made an eight, finishing the day in a tie for 65th.
It's been almost 8 months since Spieth's last quad. pic.twitter.com/0x7nGiJ1Gy— PGA TOUR (@PGATOUR) January 12, 2018
Kirk and Johnson opened with seven-under 63s to share the overnight lead.
The two Americans went through bogey-free at Waialae Country Club to hold a one-shot advantage on a congested leaderboard.
Vaughn Taylor, Kyle Stanley, Talor Gooch and Brian Harman are among those tied for third a shot back.
Peter Malnati, Daisuke Kataoka, Matt Every and Tom Hoge opened with five-under 65s.
Defending champion Justin Thomas carded a three-under 67 in his first round, going through bogey-free.
The American, a former Alabama golfer, handed ex-Georgia golfer Kevin Kisner (68) a jersey to wear on the 17th hole.
Thomas won a bet between the pair thanks to Alabama's dramatic 26-23 victory over Georgia in the College Football Playoff national championship.
|England forward Hughes given six-week ban|
|Injured Halep withdraws from WTA Finals|
|Ronaldo exit makes all the difference for Real Madrid – Luxemburgo|
|Manchester United´s Chelsea Blues and other one-sided rivalries|
|Babbel fears for Kovac´s Bayern future|
|Bradley homers again, Red Sox take 3-1 lead over Astros|
|Ayton, Doncic shine on NBA debuts|
|Leonard focusing on future after Raptors debut|
|MLS Review: Rooney stunner seals DC win, Sounders clinch play-off spot|
|Pochettino ´proud´ of Dier for Ramos tackle|
|Wallabies name three uncapped players for All Blacks clash|
|Lakers coach Walton will monitor LeBron´s minutes, plans to use deep rotation|
|Lloris: United´s Pogba unfairly judged because of transfer fee|
|´Phenomenon´ Mbappe deserves Ballon d´Or, says Buffon|
|Dodgers on cusp of World Series after beating Brewers|
|Mata braced for ´difficult month´ at Man United|
|WATCH: Rooney scores wonderful free-kick for DC United|
|Kaino handed five-week ban for striking Roberts|
|Bears star Khalil Mack ´day-to-day´ with ankle injury|
|Anthony has ´a clearer understanding´ of his role with Rockets|
|Brewers remove Miley after one batter against Dodgers|
|Rams rule out Kupp for 49ers game|
|Giants owner Mara to talk with Beckham Jr|
|Bamberg battle back to claim Champions League win|
|MLB investigated alleged Astros sign stealing, found no wrongdoing|
|Timberwolves star Wiggins to donate $22 for every point this NBA season|
|Red Sox´s Sale won´t start game five of ALCS|
|Tsitsipas and Shapovalov advance at Stockholm Open|
|Witsel to Dortmund is signing of the season - Martinez|
|Pique confident Nadal will play in 2019 Davis Cup|
|Seeds suffer in Moscow and Luxembourg|
|Johnstone grabs hat-trick as England ease past France|
|Pogba and Mourinho disagreement over Instagram video, confirms Pereira|
|Nuggets coach Malone signs contract extension|
|Mayweather accepts Khabib´s challenge: ´We´re fighting´|
|Slovenia sack Kavcic as head coach|
|Morgan and Rashid star as England win rain-reduced ODI in Sri Lanka|
|Romagnoli aims to make Gattuso proud in Milan derby|
|Naldo signs Schalke extension|
|Bills to start quarterback Anderson against Colts with Allen out|
|O´Sullivan makes 147 at ´hellhole´|
|Barcelona know when captain Messi is angry – Abidal|
|Bertens loss hands Pliskova last WTA Finals berth|
|Liverpool star Mane undergoes hand surgery|
|F1 Raceweek: Happy hunting ground for title-chasing Hamilton - US GP in numbers|
|Canelo signs record-breaking DAZN deal|
|England hit by another Vunipola injury absence|
|Gruden: Oakland Raiders ´aren´t tanking´|
|Chiesa focused and happy at Fiorentina|
|We´ll see what´s possible - Henry not limiting Monaco´s ambitions|
|Wembley sale off after Khan offer withdrawn|
|Football needs people like Arsene - Pires keen for Wenger return|
|Abbas five-for torments woeful Australia as Pakistan take control|
|Henry: Wenger and Guardiola inspirations for my coaching career|
|Pires backs Henry and Vieira for Ligue 1 success|
|Bolt rejects Valletta offer|
|Wenger ready for January return to management – but where?|
|NBA 2018-19: The LeBron James effect on teams he has joined|
|Svitolina qualifies for WTA Finals after Pliskova loses|
|Genoa will sell ´superstar´ Piatek, admits president|
|Moutinho targets European qualification with Wolves|
|Embiid: 76ers-Celtics isn´t a rivalry, they always kick our a**|
|Vinicius ´calm´ as he waits for Real Madrid chance|
|Nothing else to say - Ramos posts clip of supposed Sterling stamp|
|Chiellini joins Mind the Gap campaign to help players prepare for retirement|
|Injured Kusal Perera replaced by Kusal Mendis in Sri Lanka squad|
|Big names return for Scotland´s November Tests|
|Essien tells Loftus-Cheek to stay and fight for Chelsea chance|
|Nainggolan relishing challenge of first Milan derby|
|Curry: Slap me if I tire of championship celebrations|