Ayrshire, Scotland (My Sportsbook) - American Steve Marino took the clubhouse lead Friday with a two-under 68 in the second round of the 138th British Open Championship at Turnberry.

Marino stands at five-under-par 135. The 29-year-old is competing in just his fourth career major championship, and first British Open.

Mark Calcavecchia, the 1989 British Open champion, posted a one-under 69 and is in second place at four-under-par 136.

First-round leader Miguel Angel Jimenez carded two birdies on the back nine to recover a pair of his lost strokes. However, the Spaniard managed just a three-over 73 to slip to three-under-par 137.

He was joined there by two-time U.S. Open champion Retief Goosen, Ross Fisher, who owns two European Tour titles, and Kenichi Kuboya. Goosen shot even-par 70 in the second round, while Fisher carded a two-under 68.

Kuboya, who posted a two-over 72, became the first player to reach seven-under par with birdies on one and four. He slid down the leaderboard in part due to a lost ball on the 13th.

While those near the top of the leaderboard posted solid scores, Friday's windy, damp and cool conditions sent scores soaring for some of the best players in the world.

Former Masters champion Mike Weir entered the second round tied for 10th place, but stumbled to an eight-over 78.

Weir dropped to five-over-par 145 and is danger of missing the cut, which will likely fall at three- or- four-over par. Weir stands alongside European Ryder Cup captain Colin Montgomerie (74), 2003 British Open winner Ben Curtis (80) and 2004 Open champion Todd Hamilton (70).

K.J. Choi (72), Tim Clark (75) and Anthony Kim (73) finished two rounds at plus-six, while former PGA Championship winner David Toms was seven-over-par 147 after two rounds. He shot five-over 75 Friday.

U.S. Open champion Lucas Glover struggled to a seven-over 77 and will miss the cut at plus-nine.

Marino had an up and down front nine with three pars, three bogeys and three birdies. He bogeyed the second, but came right back with a birdie on the third. Marino dropped another stroke on the fourth and followed with birdies on five and six to move to minus-four.

At the par-five seventh, Marino dropped another stroke. His bogey on the 10th was his fourth and final bogey of the day.

Marino posted his fourth birdie of the round on No. 14, where he rolled home a 16-footer. After a pair of pars, Marino poured in a 20-footer for eagle to jump to minus-five. He parred the last to secure the clubhouse lead.

For Marino, this is his first major championship of the season and just the fourth of his career. He has played two U.S. Opens, 2007 and 2008, and missed the cut both times.

In his only other start in a major, the 29-year-old Marino tied for 60th at last year's PGA Championship.

Calcavecchia stumbled early, but rallied in the middle of his round. He dropped shots on two and five to dip to minus-one.

The 49-year-old birdied the par-five seventh for the second straight day and regained his other lost stroke with a birdie on the par-four 10th.

Calcavecchia birdied the 12th, then nearly holed his approach shot at the par- four 14th. He tapped in his birdie putt to gain a share of the lead at minus- five. However, he gave that stroke back with a bogey on the 15th, then parred his final three holes to end one back.