Leon, Mexico (SportsNetwork.com) - Justin Thomas carded a 2-under 70 on Friday to remain on top of the leaderboard of the El Bosque Mexico Championship.
Thomas, who held a share of the first-round lead, finished 36 holes at El Bosque Golf Club at 8-under-par 136.
"I've just been staying really patient and really calm," Thomas said. "I'm just trying to hit each shot the best I can."
Nathan Green (70) and Sam Saunders (68) shared second place at 7-under, while Nick Flanagan (69) and Daniel Berger (67) were tied for fourth at minus-6.
Nathan Tyler (68), Peter Tomasulo (69), Bill Lunde (68) and Jonathan Randolph (70) shared sixth place at 5-under 139.
First-round co-leader Brad Schneider tripped to a 2-over 74 during his second round to fall into a tie with Aaron Goldberg (71) for 10th at 4-under 140.
Green held the clubhouse lead after the morning wave, as his 70 began with an outward 36 that consisted of two birdies, a pair of bogeys and five pars.
He met the overnight leaders with a birdie at the 10th and after parring his next six holes, the Australian rolled in another birdie at the 17th to claim the outright lead at minus-7. He parred the last to finish there.
Green's lead lasted until Schneider converted birdie efforts at the sixth and eighth to move to 8-under.
Schneider moved two clear of the field with a birdie at the 10th, but fell right back to 8-under with a bogey at the 11th.
He then tripped to a double-bogey 6 at the 13th and added bogeys at the 15th and 16th to fall well off the pace.
Thomas, meanwhile, had parred his first nine holes to remain at 7-under before converting a pair of birdies at the 10th and 13th to jump into the lead at minus-8.
A bogey at the 15th dropped him back to 7-under and into a tie with Green, but he reclaimed the outright lead with a birdie at the 17th. Thomas parred the last to end at 8-under.
Saunders countered two bogeys with four birdies and an eagle during his round to earn his share of second place.
NOTES: Thomas is seeking his first career win on the Web.com Tour. He has finished tied for fifth two times this season ... The cut line fell at 1-over- par 145, with 70 players advancing to the weekend.