James Hahn birdied the final hole Thursday for a six-under-par 64 and a share of the first-round lead with Ricky Barnes in the AT&T Byron Nelson.
Matt Kuchar, Jhonattan Vegas, Jason Kokrak and Cameron Tringale shot 66, and top-ranked Dustin Johnson topped the group at 67, a stroke ahead of fourth-ranked Jason Day and Jordan Spieth, the No. 6 player competing in his hometown event in Irving, Texas.
Masters and defending Nelson champion Sergio Garcia had three bogeys on the front nine and just one birdie in a 73 that left him tied for 93rd.
Brooks Koepka, who lost to Garcia on the first playoff hole at the TPC Four Seasons a year ago, joined Johnson and five others at 67.
Hahn finished a bogey-free round with a 22-foot birdie putt on 18 to match his lowest round of the season. The two-time tour winner saved par with a 24-footer on 14. Hahn's first four birdies were inside 10 feet.
Barnes, who has made four straight cuts after missing 10 of his previous 13, started a run of three straight birdies with a chip-in on his 15th hole, the par-4 sixth. He had two bogeys.
"I'm having signs of brilliancy," said Barnes, still looking for his first win in his 255th PGA Tour start. "I just need to put it all together."
The event is the last at TPC Four Seasons, ending the tournament's 35-year run in Irving. The tournament will move to the new links-style Trinity Forest Golf Club south of downtown Dallas next year.
Thompson's first-round 65 leads at Kingsmill Championship
Lexi Thompson had six birdies in a seven-hole stretch and finished with a six-under 65 on Thursday to take the first-round lead in the Kingsmill Championship at Williamsburg, Va.
Playing her third tournament since losing the ANA Inspiration in a playoff after being penalized four strokes for a rules violation that a TV viewer spotted, Thompson had a one-stroke lead over U.S. Solheim Cup teammates Gerina Piller and Brittany Lincicome and young American Angel Yin.
Thompson played her opening nine in even par with a birdie on No. 11 and a bogey on No. 17, then birdied No. 1 and Nos. 3-7 on Kingsmill Resort's River Course.
Top-ranked Lydia Ko was two strokes back at 67 along with Sarah Jane Smith and Giulia Molinaro. Defending champion Ariya Jutanugarn shot a 72.
McCarron eagles final hole to forge tie
Scott McCarron eagled the par-five 18th hole for a seven-under 65 and a share of the first-round lead in the Regions Tradition, the first of the PGA Tour Champions' five majors. Lee Janzen, Jeff Sluman and Miguel Angel Jimenez joined McCarron atop the leaderboard at Greystone in Birmingham, Ala.
Sluman and Jimenez closed with birdies, and Janzen had a run of six birdies and a bogey from holes 10-17. McCarron was left with a short eagle putt after his approach bounced off the grandstand on No. 18.