Stewart Cink sets 36-hole scoring mark to take the lead at RBC Heritage.

Two-time champion Stewart Cink moved into position for a third RBC Heritage title, shooting a second consecutive 63 to set the 36-hole scoring mark at Harbour Town in Hilton Head Island, S.C. Cink, 47, appears unstoppable after two amazing days. He sits at 16-under 126, five shots ahead of Corey Conners. The previous best midway score was 129, set by Jack Nicklaus en route to victory in 1975 and matched by Phil Mickelson, who wound up third in 2002. Conners shot 64 and was 11 under. Emiliano Grillo (64) was another shot behind. Fourth-ranked Collin Morikawa, preparing to defend his PGA Championship title next month, was tied for fourth at 9 under with Sungjae Im (65), Billy Horschel (67) and Cameron Smith, who followed his opening-round 62 with a 71. Cink hasn’t finished in the top 20 at Harbour Town in a decade, hadn’t led halfway since the Travelers Championship in 2008 and is closer to the PGA Tour Champions than his prime. Andrew Landry (Arkansas Razorbacks) shot a 70 for the second day in a row and is at 2-under 140. Austin Cook (Jonesboro, Razorbacks) shot a 74 on Friday and missed the cut by one stroke.