Londoner Brian Davis carded a second-round 69 to lift himself into contention in the Turning Stone Resort Championship in Verona, New York.
Davis had a mixed round as he began by picking up a shot at the first to move to two under but then in six holes from the fourth three further birdies were interspersed with three bogeys.
He stopped the rot by picking up shots at the 10th and 12th, before having a steadier run in with seven successive pars.
That left him four under for the tournament and four behind overnight leader Jeff Overton, who also shot a 69 - to lead by one from his fellow American Tag Ridings.
Heavy rain and hail resulted in two suspensions of play, and the second round was eventually suspended because of darkness with 23 players still on the course.
Australian Jason Day finished on six under after firing a 69 which included a hole-in-on on the 179-yard sixth.
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