Russell Henley produced a flawless second round to surge into a four-way tie for the Travelers Championship lead on Friday.
American Henley was a bogey free, carding a five-under-par 65 to earn a share of the one-stroke advantage in Cromwell, Connecticut.
After teeing off in 23rd position, the two-time PGA Tour champion - who holed five birdies - is now level at seven under alongside Tyrone Van Aswegen, Daniel Berger and Marc Leishman at TPC River Highlands.
South African Van Aswegen also produced a blemish-free round, birdieing three consecutive holes from the ninth to the 11th for a four-under-par 66.
Berger and Australian Leishman both dropped shots throughout the second round following their respective rounds of 67 and 68.
Jerry Kelly, one of the overnight leaders on Thursday, dropped a stroke off the pace heading into the penultimate round.
Kelly, who was level atop the leaderboard with Vaughn Taylor and Andrew Loupe, went from a first-round 64 to an even-par 70.
Robert Garrigus (67), Russell Knox (67) and Patrick Rodgers (66) are also six under through 36 holes.
A stroke further back is Taylor, as well as Vijay Singh (68), Jon Rahm (70), Brian Stuard (65), Scott Pinckney (67), Paul Casey (67) and Blayne Barber, who posted a six-under-par 64.
Two-time Masters champion Bubba Watson is three under following his 70, while Loupe's 76 saw him miss the cut at even par.