Cameron Champ bogeyed his final two holes to surrender sole leadership of the Sanderson Farms Championship in Mississippi.
Big-hitting Champ, who started on the back nine, could not match his opening 65 and was clinging to a one-shot lead until bogeys on the eighth and ninth holes saw him card a 70.
That left him level with Norman Xiong and one shot clear of Shawn Stefani and Jonathan Byrd.
While Champ remained at the top of the leaderboard, his closest challengers from the end of the first round largely fell away on Friday.
Cameron Triangle followed up his opening 66 with a 73, dropping shots on the second and 16th holes with his only birdie on the par-three seventh.
Xiong, starting on the back nine, got off to a flying start with an eagle on the par-five 10th, but promptly dropped a shot on the par-four 11th.
But four more birdies on his round saw him card a 67, moving him seven places up the leaderboard.
Ireland's Seamus Power, followed up his opening 71 with a 68, to move to joint 15th, four shots off the lead.
