When Justin Thomas stepped onto the 17th green at Aronimink on Monday, he wasn't just testing the turf—he was mapping out a chess match. With his caddie placing hole-sized discs on every corner of the green, all perched on knobs, Thomas went to work. Whether chipping or putting, it was a challenge that would define the week ahead.

Aronimink Golf Club is known for its 180 bunkers that frame the landing areas, but for the game's longest hitters, those sand traps aren't the main concern. As the first official day of practice for the PGA Championship unfolded, one thing became clear: accuracy this week isn't about avoiding bunkers or the thick rough. It's about hitting the right spots on the greens.

"Off the tee it's not extremely challenging," said Keegan Bradley, who won on a soggy Aronimink in 2018 at the BMW Championship. "But the greens get really crazy, and they are really mounded and hilly just like a lot of Northeast courses. So to put the ball in the right spot is really important."

The course was buzzing with activity, both inside and outside the ropes, despite temperatures struggling to reach 60 degrees Fahrenheit. That's what happens when the PGA Championship moves to May and heads to the northern United States. Bethpage Black was even colder in 2019 before warming up as the week went on, and the same is expected here. For players and fans alike, layering up is the name of the game.

Thomas was among the few who made a scouting trip during a week off, giving him a chance to get reacquainted with a course that's seen some changes since his last visit in 2018. Fewer trees line the fairways, and the conditions are pristine. In fact, the last day for member play was November 2nd, meaning the course has been resting and ready for this moment.

"It's pretty generous off the tee," Thomas noted. "I don't remember, but it feels like at some point you can tell they took out a lot of trees. The holes that feel open, the rough is healthy. But the greens have a lot of slope. It's going to be dependent on how firm and fast they can get."

There was another practical reason for Thomas's early arrival: he could get in 18 holes without feeling like he'd lost an entire day. In the lead-up to a major championship, every moment counts. "Practice rounds at the PGA are the most miserable ever," Thomas admitted after playing nine holes. But for a player looking to make a statement, it's all part of the preparation.