ERIN, Wis. (AP) — The Latest on the U.S. Open (all times local):

1:35 p.m.

Louis Oosthuizen is making the biggest move the morning in the U.S. Open at Erin Hills.

Oosthuizen ran off four birdies on the front nine and made the turn at 4-under par, leaving him only three shots behind. The leaders still had another two hours before they teed off. Oosthuizen, the former British Open champion at St. Andrews, was hopeful of at least giving them something to think about.

Also starting strong was Justin Thomas with tap-in birdies on his opening two holes to reach 4 under.

Low scores were available. That’s been the case all week at Erin Hills. Not everyone can take advantage. Jordan Spieth was even par through 12 holes and going nowhere. Former U.S. Open champion Webb Simpson shot a 71, though he was still seven shots behind.

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12:20 p.m.

Zach Johnson holed an 8-foot putt on the par-3 ninth for his third birdie of the front nine. The two-time major champion is 3 under for his third round at the U.S. Open and has moved into the top 25 at Erin Hills.

Not bad for a guy who made the cut on the number.

With only eight shots separating top to bottom going into the weekend, someone from way back has a chance to make up ground in a hurry.

Jordan Spieth is not among them. He is 1 over for his round with six holes.

Clouds are starting to gather over Wisconsin, and there’s a chance the leaders might have to cope with bad weather in the afternoon. They are still about three hours away from teeing off.

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The U.S. Open is wide open going into the weekend.

Paul Casey, Brooks Koepka, Brian Harman and Tommy Fleetwood share the 36-hole lead at Erin Hills. And if that’s not enough of a traffic jam at the top, 18 players are separated by three shots to start the third round.

But that’s not all that makes the possibilities so limitless Saturday.

Only eight shots separate the leaders from the players who made the cut on the number. That’s the lowest differential after 36 holes in the U.S. Open, mainly because until 2012, everyone within 10 shots of the lead made the cut at the U.S. Open.

Now consider that the largest 36-hole comeback in U.S. Open history was 11 shots by Lou Graham in 1975. It’s wide open.