Stewart Cink made history after moving five shots clear in his pursuit of a third RBC Heritage title. (More Sports News)
Two-time champion Cink carded a second successive 63 to set the 36-hole record at Harbour Town on Friday.
Cink sits at 16-under 126, five strokes ahead of Corey Conners – eclipsing the previous best midway score of 129 set by Phil Mickelson (2002) and Jack Nicklaus (1975).
The 47-year-old Cink also became the oldest player to hole the 36-hole lead at the RBC Heritage – his last 36-hole lead on the PGA Tour was at the 2008 Travelers Championship.
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Cink has catapulted himself to the top of the leaderboard alongside his son and caddie, Reagan.
"He's not just my son caddying, he's a professional caddie doing an excellent job," he said. "He could caddie for any player in the world right now."
Canadian Conners posted a seven-under-par 64 to be outright second, a stroke ahead of Emiliano Grillo (64) heading into the weekend, while overnight leader Cameron Smith (71) fell seven shots behind.
"I think the golfing gods got a few back on me today," Australian Smith said.
Masters runner-up Will Zalatoris shot a four-under-par 67 to be tied for 11th position, nine strokes adrift of Cink.
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World number one Dustin Johnson climbed 27th spots following a second-round 67 as he sits 11 shots back.
Defending champion Webb Simpson, meanwhile, is three under at the half-way stage after his 68.
