HILTON HEAD ISLAND, S.C. (AP) — Two-time champion Stewart Cink moved into position for a third RBC Heritage title, shooting a second straight 63 to set the 36-hole scoring mark at Harbour Town.

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 was hardly overwhelmed by the scores he posted, chalking them up to smart preparation and strong execution alongside his 24-year-old son, Reagan, who’s caddying for him.

“It doesn’t feel all that special, to be honest with you,” Cink said. “We just kind of worked our game plan.”

It was certainly unexpected. 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.

Yet Cink has had a renaissance on golf’s biggest stage this season. He won for the first time in 11 years at the Safeway Open in September and has added five top-20 finishes including a tie for 12th last week at the Masters.

Cink was down three shots to Conners when he teed off Friday.

No matter. Cink quickly erased the deficit with an eagle on the par-5 second and a birdie on No. 3. Cink moved in front with a birdie on the sixth and steadily built his margin the rest of the way, adding birdies on the 11th, 13th, 15th and 17th holes.

The veteran is two solid rounds away from adding a third plaid jacket to the two he earned in 2000 and 2004. In both of those wins, Cink came from behind on Sunday. This time he’ll need to just maintain his strong overall play.

Since Reagan became his caddie, father and son have been collaborating on strategy before tournaments.

“We call it bludgeoning and we’re just bludgeoning that plan almost to death,” the elder Cink said with a grin. “When you manage yourself around a course like that and execute, the golf courses yield.”

PGA Tour RBC Heritage Scores

Friday

At Harbour Town Golf Links

Hilton Head, S.C.

Purse: $7.1 million

Yardage: 7,121; Par: 71

Second Round

Stewart Cink 63-63 — 126

Corey Conners 67-64 — 131

Emiliano Grillo 68-64 — 132

Cameron Smith 62-71 — 133

Collin Morikawa 65-68 — 133

Sungjae Im 68-65 — 133

Billy Horschel 66-67 — 133

Wesley Bryan 68-66 — 134

Tom Hoge 67-67 — 134

Harold Varner III 66-68 — 134

Abraham Ancer 69-66 — 135

Shane Lowry 70-65 — 135

Matt Fitzpatrick 71-64 — 135

Will Zalatoris 68-67 — 135

Michael Thompson 68-67 — 135

Lucas Glover 67-69 — 136

Sung Kang 68-68 — 136

Charles Howell III 66-70 — 136

Robert MacIntyre 70-67 — 137

Adam Schenk 68-69 — 137

Robert Streb 68-69 — 137

Ian Poulter 69-68 — 137

Chris Kirk 70-67 — 137

Sepp Straka 70-67 — 137

Brian Harman 67-70 — 137

Camilo Villegas 69-68 — 137

Matt Wallace 65-72 — 137

Charley Hoffman 68-69 — 137

Branden Grace 68-69 — 137

Dustin Johnson 70-67 — 137

Brian Stuard 70-68 — 138

Dylan Frittelli 71-67 — 138

Mackenzie Hughes 67-71 — 138

Maverick McNealy 71-67 — 138

Cameron Davis 69-69 — 138

Kevin Streelman 67-71 — 138

Matt Kuchar 70-68 — 138

Si Woo Kim 71-67 — 138

Daniel Berger 67-71 — 138

Russell Henley 69-70 — 139

Christiaan Bezuidenhout 70-69 — 139

Lee Westwood 71-68 — 139

Tom Lewis 72-67 — 139

Webb Simpson 71-68 — 139

Danny Willett 68-71 — 139

Tyrrell Hatton 73-66 — 139

Ryan Moore 70-69 — 139

Harry Higgs 71-68 — 139

Chase Seiffert 71-68 — 139

Doug Ghim 70-69 — 139

Brice Garnett 69-70 — 139

Rory Sabbatini 70-69 — 139

Alex Noren 71-68 — 139

Matthew NeSmith 68-72 — 140

Wyndham Clark 70-70 — 140

Sam Burns 72-68 — 140

Brendon Todd 70-70 — 140

Scott Piercy 70-70 — 140

Kyoung-Hoon Lee 67-73 — 140

Denny McCarthy 73-67 — 140

Andrew Landry 70-70 — 140

Kevin Tway 69-71 — 140

Brandt Snedeker 69-71 — 140

Scott Harrington 69-71 — 140

Luke List 74-66 — 140

Missed cut

Patrick Rodgers 72-69 — 141

Pat Perez 72-69 — 141

Sebastian Munoz 72-69 — 141

Hudson Swafford 70-71 — 141

Byeong Hun An 72-69 — 141

Danny Lee 68-73 — 141

Austin Cook 67-74 — 141

Jim Furyk 70-71 — 141

Tommy Fleetwood 76-65 — 141

Jason Dufner 71-71 — 142

Paul Casey 74-68 — 142

Patrick Cantlay 71-71 — 142

J.T. Poston 74-68 — 142

Rafael Campos 70-72 — 142

Kyle Stanley 70-72 — 142

Brian Gay 68-74 — 142

Zach Johnson 72-70 — 142

Hunter Mahan 73-69 — 142

Scott Stallings 73-70 — 143

Adam Hadwin 76-67 — 143

Vaughn Taylor 68-75 — 143

Jim Herman 75-68 — 143

Carlos Ortiz 68-75 — 143

Ryan Armour 72-71 — 143

Sergio Garcia 68-75 — 143

Ben Martin 74-69 — 143

Bill Haas 72-71 — 143

Satoshi Kodaira 72-71 — 143

Nick Taylor 69-74 — 143

Russell Knox 71-72 — 143

Patton Kizzire 74-69 — 143

Bo Hoag 72-72 — 144

C.T. Pan 72-72 — 144

Tyler Duncan 71-73 — 144

Davis Love III 74-70 — 144

Beau Hossler 74-70 — 144

Tommy Gibson 73-71 — 144

Troy Merritt 68-76 — 144

Graeme McDowell 73-71 — 144

Chesson Hadley 74-70 — 144

Peter Malnati 73-72 — 145

Kevin Kisner 72-73 — 145

Will Gordon 75-70 — 145

Ted Potter, Jr. 73-72 — 145

Adam Long 73-72 — 145

Luke Donald 73-72 — 145

Anirban Lahiri 71-75 — 146

Kevin Na 74-72 — 146

Harris English 70-76 — 146

Henrik Norlander 72-74 — 146

Mark Hubbard 73-73 — 146

William McGirt 74-72 — 146

Richy Werenski 69-77 — 146

Martin Trainer 73-73 — 146

K.J. Choi 76-70 — 146

Aaron Wise 72-75 — 147

Bo Van Pelt 73-74 — 147

Scott Brown 73-74 — 147

Xinjun Zhang 75-72 — 147

Michael Gligic 76-71 — 147

Chez Reavie 75-73 — 148

Bryson Nimmer 80-68 — 148

Robby Shelton 73-75 — 148

John Augenstein 72-78 — 150

Andrew Putnam 70-80 — 150

Doc Redman 81-71 — 152

Nick Watney 72-80 — 152

Brandon Hagy 76-76 — 152