Former champion Jim Furyk overcame a lengthy rain delay to fire a 66 to join a three-way tie for the lead following the conclusion of the second round at Hilton Head.
High winds and torrential had forced the afternoon players at the RBC Heritage to flee on Friday after South Korea's KJ Choi had posted a morning round of 67 to lead in the clubhouse on five under par.
But Furyk, a winner here in 2010, returned on Saturday morning and along with fellow American Ben Martin reached Choi's halfway target - two clear of the chasing pack.
Furyk's round was a flawless one, meaning he has now dropped just a single shot in his 36 holes at the Harbour Town Links.
Martin had reached six-under but bogeyed the ninth, his final hole of the round, to slip back into a share of the lead.
A group of 10 players share fourth place on three under par, including early starter Luke Donald and first round leader Matt Kuchar, who was caught up in the worst of the weather.
He made two double bogeys in his first six holes, gave another back on the resumption before rallying with four birdies in eight holes, only to drop another shot at the 18th to return a 73.
Seven players are a further shot back, including Germany's Martin Kaymer after a 67, Graeme McDowell (69) and former major champions Geoff Ogilvy and Charl Schwartzel.
The cut came in at four-over-par and the players will go out in threeballs later on Saturday, from the 1st and 10th tees, in a bid to complete the penultimate round.