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.
26. Juli 2017
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|Costly Dhawan drop leaves Gunaratne with fractured thumb|
|Guardiola refuses to rule out City rivalling Madrid in Mbappe pursuit|
|Recovering Slater expects to face Cowboys|
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|Lynn to miss up to seven months after shoulder surgery|
|Beckham happy for Madrid coach Zidane|
|Mayweather-McGregor to be shown in U.S. movie theatres|
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|Jaziri saves eight match points to win in Atlanta|
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25. Juli 2017
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|Real Madrid´s attack doesn´t need Mbappe to wreak havoc, claims Casemiro|
|Warriors officially confirm new deals for Curry, Durant|
|Balotelli fitter than last season, warns Dante|
|Mata and Herrera provide Manchester United injury boost|
|Orlando capture Dwyer in record swoop|
|Bardsley bolsters Burnley backline options|
|Ibrahimovic still a leader at Old Trafford – Pogba|
|Wozniacki prevails in Bastad, Duan dumped out of Jiangxi Open|
|Thiago Maia joins Brazilian influx at Lille|
|LeBron James refutes report he´d be ´tempted to beat Kyrie Irving´s a**´|
|WATCH: Neymar´s aim defeats Messi and Suarez|
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|Mourinho wants a midfielder and winger at Man Utd|
|Peerless Peaty breaks WR twice in one day... with final still to come|
|Mourinho slams UEFA over Bailly ban|
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|Dhawan and Mukund to open for India|
|Conte pleased with Morata cameo|
|F1 Raceweek: New-look Hamilton a cut above in Budapest? Grosjean cooking up a storm|
|Kaka uncertain of Orlando future as he targets MLS play-offs|
|Cassano should be applauded, says Prandelli|
|Sanches seeking to swap Munich for Milan|
|Brown loaned to Brighton after signing Chelsea contract|
|Stokes holds no grudge against Rabada|
|VAR would have ruled out ´Hand of God´ goal, Maradona admits|
|Former Ireland scrum-half O´Leary retires|
|Bordeaux abandon Wellington Silva transfer|
|Joshua-Klitschko II ´pencilled in´ for November 11 - Hearn|
|Kaka backs Bonucci to help Milan rediscover glory days|
|Chelsea 2 Bayern Munich 3: Muller at the double as Bayern bounce back|
|Injured Michu confirms retirement|
|Barrington backing Farrell to inspire England to World Cup glory|
|Neymar will make right decision amid PSG links - Kaka|
|Wagner backs Liverpool to win the league|
|Monaco deny world-record €180m Real Madrid deal for Mbappe – report|
|Higuain: I need to score more in Europe|
|Soliola given five-match ban for Slater hit|
|Devastated Rutherford to miss World Championships|
|Real Madrid ´would be alright´ but Dolberg in no rush to leave Ajax|
|Canada rugby sevens wing Zaruba lands NFL contract|
|Mane, Ings back in full Liverpool training|
|Mahrez would do great things at Roma – Gonalons|
|Sensational Peaty smashes his own world record|