Matt Fitzpatrick ended day two of the RBC Heritage with a one-shot lead after carding an eight-under-par 63.
The Englishman made eight birdies, including sinking a 36-foot putt on hole 15, in a bogey-free second round at Hilton Head.
Fitzpatrick - the 2022 US Open champion - began Friday in a six-way tie for third following an opening round of 65.
The 31-year-old tops the leaderboard on 14 under par at the halfway stage, with Norway's Viktor Hovland one stroke behind after retaining second spot with a second-round score of 65.
Overnight leader Ludvig Aberg dropped to joint-fourth position following three bogeys on the back nine.
Scotland's Robert MacIntyre ended the day six shots behind Fitzpatrick after posting a 68, while world number one Scottie Scheffler carded a 67 and is seven shots off the pace.
Watch the RBC Heritage live on Your Site Golf. Coverage of the PGA Tour Signature Event begins on each day of the tournament at 12pm. or .
