Min Woo Lee was left stunned by one decision the PGA Championship organizers made ahead of the second round—and it's a move that's already shaking up the leaderboard.

Before the tournament kicked off at Aronimink Golf Club, there were whispers that the course might not offer enough of a challenge. Rory McIlroy even suggested that players wouldn't need much strategy, predicting that most holes would simply demand long drives without the need for precision off the tee. But McIlroy has already been proven wrong, as the course has played far tougher than anyone expected.

While many players have struggled to post low scores, Min Woo Lee sits near the top of the leaderboard at three under par. The Australian has been reflecting on the unique challenges Aronimink presents, and he's particularly focused on one eye-opening hole that caught him off guard.

Despite early predictions of a birdie-fest, Alex Smalley and Maverick McNealy lead the field at just four under after two rounds. That's why Lee's latest claim carries weight: he believes Aronimink is playing more like a U.S. Open than a PGA Championship.

"I wouldn't say the toughest conditions, but it is very tough," Lee said after the second round. "I think the fairways are wide enough to not make it the hardest course. But the scores are showing that it is very tough. It feels like a U.S. Open course, with the rough pretty thick, especially around the greens. And it's windy—that doesn't help. Then obviously the undulating greens—it's tough. I saw plenty of putts miss from short range, even myself. It's one of those where you can't let your mind spiral. But it is tough, I'm not going to say it isn't tough, because it is tough. That's what you expect at a course like this."

The par-3 8th hole at Aronimink was the toughest on the course during the first round. The event organizers decided to extend the hole to a massive 245 yards on day one, then shortened it to just 173 yards on day two. Lee expected to be challenged at this week's major, but the drastic changes to the 8th hole have genuinely taken him by surprise.

"Obviously, the one on 8 got me," Lee admitted. "That 245-yard par-3 into the wind was brutal. Then they move it up to 173 yards the next day—you just have to adjust on the fly. It's a different kind of test, and it keeps you on your toes."

For fans and players alike, this PGA Championship is proving to be anything but predictable. And if Lee's reaction is any indication, Aronimink is delivering a major challenge that's worthy of the game's biggest stage.