Romero, who finished third last year, had nine birdies, a bogey and a double bogey for a one-point lead over Gary Woodland.
The scoring system awards eight points for double eagle, five points for eagle, two for birdie, zero for par, minus-one for bogey and minus-three for double bogey or worse.
Former Swainsboro, Ga., resident Will Claxton has 13 points, one more than Evans resident Vaughn Taylor.
CHAMPIONS TOUR: In Blaine, Minn., Mark Wiebe followed his Senior British Open playoff victory with 8-under-par 64 in the 3M Championship to take a one-stroke lead over Kenny Perry and Corey Pavin.
Four days after beating Bernhard Langer on the fifth extra hole at Royal Birkdale, Wiebe had eight birdies in a bogey-free first round at TPC Twin Cities. He birdied five of the last seven holes on the front nine.
Perry is making his first start since winning the Senior Players Championship and U.S. Senior Open in consecutive starts for his first major victories. He skipped the Senior British Open because of a family commitment.
Perry birdied the first three holes and five of the first six. He birdied three of four holes midway through his back nine to get to 8-under before bogeying No. 17.
Bart Bryant, Peter Senior, Jeff Brehaut, John Riegger and Tom Pernice Jr. shot 66.
Augusta native Larry Mize shot 71.
WEB.COM TOUR: In Canonsburg, Pa., Whee Kim had 6-under-par 65 and leads the Mylan Classic by two shots.
The Korean, who opened with 66, is at 11-under 131. Tied for second place are former Clemson golfer Ben Martin (67 on Friday) and Blayne Barber (66).
Aiken’s Kevin Kisner shot 70 and is at 141. Aiken native Matt Hendrix had 75 to finish at 145, missing the cut by two shots.