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Dublin, Ohio • Paul Casey expected to be chasing someone Friday in the Memorial, figuring it would be Rory McIlroy.

After two holes, Casey had the lead to himself at Muirfield Village, and that was only the start of another big day. He took advantage of the par 5s for another 6-under 66, giving him a three-shot lead over Masters champion Bubba Watson going into the weekend.

McIlroy, whose 63 was the lowest first round in the 39-year history of the tournament, was barely in the picture. He was 15 shots worse with a 78, courtesy of three straight double bogeys and his fourth straight PGA Tour event with a nine-hole score of 40 or higher. McIlroy went from a three-shot lead to nine shots behind.

"To be honest, I thought I was going to be playing a round to try and maybe catch a couple of guys," Casey said. "I woke up checking the scores to see what Rory was going to be. That's really what I was going to be doing — see how many under I was going to have to try to shoot to chase. Obviously, that didn't happen."

Casey, taking another step on a long road back from injuries that nearly derailed his career, was at 12-under 132.

Champions Tour

Mark Calcavecchia and Wes Short Jr. shot 6-under 66 to share the first-round lead in the Champions Tour's Principal Charity Classic in Des Moines, Iowa.

LPGA Tour

Jennifer Johnson matched the course record with a 9-under 62 to lead the first round in the ShopRite LPGA Classic in Galloway Township, N.J. Golf results

PGA-Memorial Par

At Muirfield Village Golf Club course

Dublin, Ohio

Purse • $6.2 million

Yardage • 7,392; Par • 72 (36-36)

Second-round leaders

Paul Casey 66-66 — 132 -12

Bubba Watson 66-69 — 135 -9

Chris Kirk 66-70 — 136 -8

Hideki Matsuyama 70-67 — 137 -7

Martin Flores 69-68 — 137 -7

Thorbjorn Olesen 71-67 — 138 -6

Hunter Mahan 68-70 — 138 -6

Ryan Moore 68-70 — 138 -6

Scott Langley 72-66 — 138 -6

Camilo Villegas 71-68 — 139 -5

Scott Brown 70-69 — 139 -5

Brendon Todd 71-68 — 139 -5

Gary Woodland 71-68 — 139 -5

Adam Scott 69-70 — 139 -5

Robert Streb 72-67 — 139 -5

Marc Leishman 71-68 — 139 -5

Bill Haas 73-67 — 140 -4

Nick Watney 69-71 — 140 -4

Justin Hicks 73-67 — 140 -4

Ben Curtis 69-71 — 140 -4

Billy Horschel 71-69 — 140 -4

Luke Donald 71-69 — 140 -4

Jason Dufner 71-69 — 140 -4

Kevin Na 72-69 — 141 -3

Jordan Spieth 69-72 — 141 -3

Dustin Johnson 73-68 — 141 -3

Jason Day 72-69 — 141 -3

Rory McIlroy 63-78 — 141 -3

Charley Hoffman 69-72 — 141 -3

Andrew Svoboda 72-69 — 141 -3

Pat Perez 71-70 — 141 -3

Jim Furyk 73-68 — 141 -3

Charl Schwartzel 72-69 — 141 -3

Steve Stricker 71-70 — 141 -3

Kevin Kisner 69-72 — 141 -3

Justin Thomas 73-68 — 141 -3

Robert Garrigus 72-70 — 142 -2

Also

Daniel Summerhays 74-70 — 144 E

PGA-Champions Tour

At Wakonda Club, Des Moines

Purse • $1.75 million

Yardage • 6,910; Par • 72 (36-36)

First-round leaders

Mark Calcavecchia 34-32 — 66

Wes Short, Jr. 34-32 — 66

Bobby Clampett 33-34 — 67

Peter Senior 35-32 — 67

Steve Lowery 33-34 — 67

Doug Garwood 35-33 — 68

Scott Simpson 35-33 — 68

John Riegger 36-32 — 68

Tom Pernice Jr. 35-33 — 68

Michael Allen 35-33 — 68

LPGA Tour

At Stockton Seaview Hotel and Golf Club, Bay Course, Galloway Township, N.J.

Purse • $1.5 million

Yardage • 6,177; Par • 71 (37-34)

First-round leaders

Jennifer Johnson 34-28 — 62

Haru Nomura 32-31 — 63

Christina Kim 33-31 — 64

Na Yeon Choi 33-33 — 66

Inbee Park 33-33 — 66

Chella Choi 35-32 — 67

Laura Diaz 36-31 — 67

Sandra Gal 36-31 — 67

Sarah Kemp 34-33 — 67

Jennifer Kirby 36-31 — 67