Ernie Els took 70 for three under with USPGA champion YE Yang at two under.
The Scot was on three under when he found trees at the 476-yard ninth.
Lee Westwood of England and Rory McIlroy of Northern Ireland tied for third place with three under par.
Co-overnight leader Davis Love crashed out with an abysmal 83, while Tiger Woods (69) edged to three under.
In the Unibond first division south Grantham Town made it three wins out of three under manager Phil Starbuck.
Ian Poulter (70) also reached four under as fellow Englishman Greg Owen shot 65 to climb to three under.
Harrington and Hamill both bogeyed the final hole in regulation play to drop back to three under par with McGrane.
Fellow Englishman Luke Donald lies third on 10 under, while Tiger Woods is back on three under after a 73.
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Under the scheme, counties will be eligible for payouts for matches in which they field two under-22 and three under-26 players.
Harrington is on three under and holds a one-shot lead over England's Simon Wakefield, Swede Joakim Backstrom and Argentina's Andres Romero.
He bogeyed that hole and 18 to finish at three under par.
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The English duo of David Lynn and Ben Mason hold the early clubhouse lead at the Forest of Arden on three under.
The men's mug shots were also recognized by another woman who said she'd been raped by the three under similar circumstances last month.
Unfortunately for the popular Spaniard his bogey putt slid past the hole, although a birdie at the last left him three under par.
He was found guilty of six offences of fraud and and three under the Proceeds of Crime Act at Manchester's Minshull Street Crown Court.
English duo Ian Poulter (70) and Anthony Wall (68) and France's Christian Cevaer (71) are in a tie for second on three under par.
Langer picked up another shot on the par-three eighth and made par on the ninth to reach the turn at three under for the day.
Fellow Englishman Luke Donald's hopes of claiming victory look to have faded after a 74, that leaves him five shots off the pace at three under.
Clarke's score represented a dramatic improvement on Saturday's eight-over round and he was three under after 10 before bogeys on 14 and 15 blemished his card.
The world number 37 was briefly joined by Els at three under but moved into a two-shot lead after his only birdie of the day on the fifth.
Northern Ireland's McDowell shot 68 to reach three under before the Masters champion barged his way into a tie for second at one under with a stunning 66.
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South African Ernie Els added a round of 68 to his earlier 69 to leave him tied with 11 other players, including Fijian Vijay Singh, on three under.
Last week's British Masters winner Johan Edfors led the first round field on three under, followed by England's Iain Pyman, Italy's Ignacio Garrido and Cevaer a shot back.
Casey and Laird ended four under, Rose was three under, and Poulter squeezed into the weekend right on the cut mark at two under after a pair of 69s.
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He took over a team that had gone 2-14 and just three years later guided the franchise to the first of five Super Bowl wins (three under his reign).
Woods saw his hopes of an unlikely fourth Open title end with two double bogeys on the front nine on the way to a final-round 72 to finish three under.
Australia's Robert Allenby (73) was three under, Englishman Justin Rose was another shot back after a 72 while South African Louis Oosthuizen, the Open champion, remained last on level par.
And Alex Cejka, the German who shared Rose's lead after the first round, also struggled, striking five bogeys in a three-over-par round of 73 to finish the day on three under.
Phil Mickelson and Sergio Garcia have a lot of work to do after finishing 10 shots off the pace while Vijay Singh is on three under with a hole to play.
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