article: The American was among many who played both their first and second rounds on a calmer Friday and he followed a three-under 67 with a 69 to reach four under. Spain's Sergio Garcia shot a 70 in round two to stay two under at halfway, alongside American Scott Piercy (70). Andrew Landry led on four under after round one but is scheduled to start his second round at 12:11 BST on Saturday. However, Saturday's tee times could change because the light faded with 27 players unable to complete their second rounds. England's Lee Westwood, who posted a three-under 67 when he completed his first round early on Friday, is, like Landry, among half of the field who are scheduled to play their second and third rounds on Saturday. Northern Ireland's Rory McIlroy, Masters champion Danny Willett, Scotland's Russell Knox and Ireland's Shane Lowry will also play their second rounds on Saturday. Lowry had a two-under 68 in round one while Knox had a level-par 70. Willett had a 75 and is flirting with the cut as he is tied for 56th with McIlroy the wrong side after a seven-over 77 left him tied for 94th with the top 60 plus ties making the cut. The world number three, who won the US Open in 2011, told BBC Sport he would "need a 66" to get back in contention on Saturday. Johnson, who had a putt to win last year's US Open but took three to hand the title to Jordan Spieth, followed his bogey-free opening round with another nine holes without a dropping a shot. Starting on the 10th, he birdied the par-three 13th to go to four under but gave that back with his first and only bogey of the tournament so far on the first. A birdie on the sixth, after several missed opportunities, was reward for a disciplined and patient round and he parred his way in to finish just before sunset. "I'm in pretty good shape, so the physical part's no problem," said Johnson after completing 36 holes in a day. "But mentally you've got to make sure you stay sharp all day, because you can't go to sleep on any shot out here. "I hit so many good putts today that I thought were going in, and burned the edge or lipped out. That's just how it goes, these greens are tough." Johnson's playing partner Garcia started his second round with a bogey-five on the par-four 10th but a birdie on the 17th saw him get back to two under par. However, bogeys on the 18th and first dropped him back to level par but birdies on the second and sixth kept him in the hunt for his first major. The Spaniard, who is not renowned for his ability with the putter, made a superb scrambling par with a 50-foot putt at his last hole, the ninth. Westwood is the leading Englishman but he is yet to play his second round and is scheduled to tee off at 13:28 BST on Saturday. Andy Sullivan was among those
summary: Dustin Johnson holds the clubhouse lead midway through the second round of the storm-delayed US Open at Oakmont.