The Open Championship, St Andrews, 15-18 July
Coverage: Live on BBC TV, Red Button, BBC Sport website, with updates on BBC Radio 5 live
Full coverage details
Graeme McDowell won the US Open title last month
Graeme McDowell moved up to five under par, seven off the lead, after firing a second round of four-under 68 at the Open Championship at St Andrews.
The US Open champion's round included an eagle, six birdies, two bogeys and a double bogey and he is tied for sixth.
Overnight leader Rory McIlroy suffered the worst of the very windy conditions and carded a round of 80 which left him one under for the tournament.
Darren Clarke was four under after a second successive 70.
Clarke completed 15 holes in the worst of the weather on Friday before returning early on Saturday to complete his second round.
Play was delayed for around an hour during FRiday afternoon as gale force winds buffeted the course.
Louis Oosthuizen leads the field on 12 under after a second-round 67.
Shane Lowry fired a 73 on Friday to move to three under and Colm Moriarty also made the cut as he was one over following a 73.
Gareth Maybin fired a 76 to lie four over and will miss the halfway cut, as will two-time Open champion Padraig Harrington who registered a 77 to end six over.
McIlroy began the day two shots clear of the field after a 63 but recorded bogeys at the fourth, sixth, seventh, eighth, 13th and 15th holes, plus a double bogey at the 15th as he failed to master the horrendous conditions.
I might know how to play in the tough seaside conditions but I don't enjoy it
Clarke had birdies at the third, seventh, 13th and 14th holes and dropped shots at the fifth and 12th as he continued his good form from last week's Scottish Open.
The Dungannon player will conclude his round early on Saturday morning.
McDowell began his second round with a birdie at the first hole, but carded a double bogey at the third and a bogey at the fourth.
A birdie at the fifth, an eagle at the seventh and birdies at the eighth and ninth came as a further boost, before a bogey at the 12th saw him drop to three under.
A brace of birdies at the 16th and 18th saw him move up the leaderboard again.
"I was frustrated by a couple of three-putts in the early holes but played ok, even though I could have picked up a few more on the inward nine," said McDowell afterwards.
"Having said that, I played really well coming in considering the greens are quite quick and the conditions were difficult.
"I might know how to play in the tough seaside conditions but I don't enjoy it.
"I'm feeling better and better as the week goes on and am fully focused on what I'm doing."