Overnight leader Rickie Fowler is one of three players a shot off the pace, with just eight strokes splitting those making the cut and the world's top three players all making an early exit. He tugged a 3-wood into the rough at the par-4 11 that led to bogey, then three-putted his next two holes.
Matsuyama birdied six of his first eight holes Friday, shot 30 on his opening and flirted, albeit briefly, with shooting golf's magical 63 in a major, eventually settling for a 65 in Round 2 of the U.S. Open.
McIlroy and Day combined to play Erin Hills in 15-over for two rounds.
Sarah Stirk and Rich Beem review the big talking points from the second round of the 117th US Open at Erin Hills.
"But you never really know until you put a card in your hand and you're under the gun little bit".
"I hate just being in the situation where I've been in a good spot and maybe let it get away from me a little bit and let some mistakes compound and turn a round that you (just) kind of fight through it and end up being in a decent spot after the day", Fowler said.
Neither did McIroy and Day, though all three made their share of trips into the club-grabbing fescue as well.
Low scores were available. That should have affected everyone the same way, but it was particularly troublesome for the field's elite players.
Proof of that came from Hideki Matsuyama and Chez Reavie, both of whom shot 7-under 65 Friday.
Despite their respective struggles, neither Johnson, McIlroy or Day took issue with the course, instead taking ownership of the problems that cut their weekend short.
No one has ever broken that 63 barrier in any of golf's four major championships.
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