"I thought they had a lot of tough pins out there for Thursday", Johnson said.
Anirban Lahiri in action at the PGA Championship.
Last weekend's other big victor was Matsuyama, who fired a closing 61 to capture the World Golf Championships event in Akron, Ohio, and serve notice he was ready to challenge for a major title after a US Open runner-up effort in June.
After a four-over 75 in the first round, Fox climbed to one-under for the tournament and is seven shots behind American Kevin Kisner, who carded a second successive four-under 67, and Japan's Hideki Matsuyama, who usurped Fox with the lowest round of the tournament.
Former World number one and US PGA victor two years ago Jason Day was another who was moving into contention. Among a group of players tied for fourth at five-under is Italian Francesco Molinari, who equalled Matsuyama's 64 in the afternoon group.
Day nearly landed a rare albatross on the par-five seventh hole and the resultant kick-in eagle kickstarted a run of five birdies in the next seven holes - either side of a weather delay - to enable a five-under-par round of 66 to race to six under in total.
Clouds quickly gathered Saturday morning about the time some two dozen players were finishing the rain-delayed second round.
They did it, even though they could barely see anything as they were coming up the 18th fairway. Fowler was now in the bunch at Tied-3rd alongside An Byeong at three-under for the tournament. He made all pars on the front nine, with birdies on Nos.
"I'm riding the momentum from the round that I had on Sunday, and again, hopefully I can keep that going for 36 more holes", he said. "I just didn't make any putts". Earlier I had three-putted the 14th from around 25 feet.
The previously slumping Australian had five birdies and an eagle - his second straight on the par-five seventh hole - to get to six under for the tournament. On seventh, he went into the rough and missed regulation and on eighth he missed an eight-footer for par and on ninth he missed from just inside 10 feet.
Meanwhile, the favorite to win the competition before the start of Round One Rory McIlroy who struggled at the back nine by hitting a bogey in the 13th and a double bogey in the 14th.
"When I was 9 years old, I knew I wanted to be on the PGA Tour, " Stroud said. But I was not getting defensive. "I played even par after the delay and that's not very good in my opinion on those holes that we had left".
Big names missing the cut included Justin Rose, Bubba Watson, Sergio Garcia and Danny Willett.