Branden Grace carded a six-under 66 to take a one-shot lead after the opening round of the Texas Open.
The South African, who is without a top-10 finish this year, mixed seven birdies with a bogey in a fine start at the TPC San Antonio on Thursday.
Grace is top of a congested leaderboard, with a group of four players a shot behind him and another 13 at four under.
Americans Will MacKenzie, John Huh and Stewart Cink opened with 67s to be tied for second with New Zealander Steven Alker.
Mackenzie and Huh were runners-up at the PGA Tour event in 2014 and 2012 respectively.
Huh went through bogey-free and MacKenzie's only blemish came at the par-four 10th, while Alker birdied his final three holes.
Among those at four under and tied for sixth is Graeme McDowell, the 2010 U.S. Open champion having holed seven birdies and three bogeys.
Alongside him is Bob Estes, the 51-year-old American whose first of four PGA Tour wins came at the Texas Open in 1994.
Estes, who last won in 2002, made four birdies in a consistent opening round.
Steve Marino, Shawn Stefani, Luke List, Brooks Koepka, Noh Seung-yul, Tom Hoge, Jonathan Randolph, Robby Shelton, Ken Duke, Brian Gay and Bryce Molder are also at four under.
Defending champion Charley Hoffman made a decent start, carding a one-under 71 to be tied for 55th.
25. November 2017
|Warriors embarrass Bulls, Thunder lose despite Westbrook triple-double|
|Murray mercilessly mocks USA president Trump|
|Inspirational Smith hits century to thwart England|
|Guardiola more ´logical´ for Man United than Mourinho – Cantona|
|England unconcerned over Anderson after scare|
|Shaky starts for Greece, Russia in World Cup qualifying|
|Messi has ´no doubt´ about Real Madrid´s Champions League chances|
|England on top as wickets fall in Brisbane|
|Maxwell scores 278 in Ashes reminder|
|Falcons RB Freeman ruled out with concussion|
|Klopp quashes Conte´s recovery complaints|
|Hoeness believes in Bayern´s ´new spirit´|
|Warriors pair Durant, Green out of Bulls clash|
|Panthers activate Olsen from IR ahead of Jets clash|
|Mourinho slams Mkhitaryan for disappearing during Manchester United games|
|Newcastle beaten by Gloucester in Premiership|
24. November 2017
|Hart hails West Ham fight under Moyes|
|Ulster leave it late to deny Treviso second away victory|
|Dolphins QB Cutler out with concussion against Patriots|
|Conte calls for clarity from Chelsea on Courtois deal|
|West Ham 1 Leicester City 1: Kouyate gets Moyes up and running|
|Robinson tips Farrell for World Rugby Player of the Year|
|Manchester United midfielder Carrick undergoes heart procedure|
|Manchester City youngster Bytyqi retires with heart condition|
|England can thrive on hostile atmosphere - O´Loughlin|
|Salah could become the Premier League´s greatest African star - Lauren|
|Lauren reserves judgement on Man City´s invincible credentials|
|Goffin and Tsonga cancel each other out on opening day of Davis Cup final|
|Stafford admits ankle is ´not 100 percent´ after Lions´ loss to Vikings|
|Bayern boss Heynckes slams ´insanity´ of Champions League ticket prices|
|Messi hails Barcelona team-mates after European Golden Shoe triumph|
|Napoli´s Hamsik saves space for a Serie A title-winning tattoo|
|Jardim urges quick Monaco response to Champions League woe|
|You always have a chance - Wagner hopeful of Man City scalp|
|Chelsea´s tough title defence was to be expected - Klopp|
|Horne replaces Dunbar in Scotland XV|
|Neymar and Cavani bound by common goal at PSG|
|Simeone: Everything seems better when Atletico win|
|F1 Raceweek: Scores to be settled in Abu Dhabi|
|Injuries not to blame for Real Madrid LaLiga position - Zidane|
|Icardi could stay at Inter forever, says Spalletti|
|Former England star Owen finishes second on horse racing debut|
|Emery backs Mbappe to shine on Monaco return|
|Robben-less Heynckes handed timely Coman boost|
|Guardiola not complacent ahead of Huddersfield clash|
|Trump to ´quickly´ play golf with Woods and Johnson|
|Salah not Liverpool´s only threat, insists Conte|
|Klopp trusts Moreno ´100 per cent´ despite Sevilla shocker|
|No excuses for Conte despite Chelsea´s travel trouble|
|Salah has nothing to prove in Chelsea reunion, says Klopp|
|We´re on the Ball - Paceman Jake says England´s homework is paying off|
|Bale return could be imminent - Zidane|
|Megson´s interim role is no audition as he awaits permanent West Brom boss|
|Bosz has derby focus despite Dortmund criticism|
|Kaka predicts bright future for Milan´s Silva|
|Lyon not sorry for controversial pre-Ashes comments|
|Ashwin takes four as India skittle out Sri Lanka|
|Messi equals Ronaldo with fourth European Golden Shoe|
|Mourinho fears Fellaini exit amid Arsenal, PSG links|
|I don´t know what you want - Mourinho blasts Man United critics|
|Mourinho protecting Pogba and Ibrahimovic as they prepare for Brighton|
|Stoke to offer Crouch fresh deal|
|Record-breaker Holmes hits Fiji for six as Australia march into final|
|Del Piero expects Juventus and Dybala to rediscover top form|
|Melbourne City 1 Perth Glory 3: Ten-man hosts pay the penalty|
|Chawrasia´s challenge on track in Hong Kong|
|Herbert leads Australian Open with Day poised|
|Moyes wants greater ref protection for Carroll|
|Unsworth questions players´ commitment after Atalanta embarrassment|
|Pistorius prison sentence more than doubled|