The PGA Championship has the biggest logjam at a major in 24 years.

NEWTOWN SQUARE, Pa. (AP) — Not many players imagined Aronimink Golf Club and its wild, wavy greens would be so tough on scoring at the PGA Championship. Even fewer would have predicted Alex Smalley and Maverick McNealy to be atop the leaderboard Friday.

What to expect the rest of the weekend? Pretty much anything.

“Anyone who makes the cut, they’ve got to feel they have a shot in the tournament,” said Rory McIlroy, who found himself only five shots behind with 29 players — including Scottie Scheffler and six other major champions — ahead of him.

Two long days at Aronimink produced the highest 36-hole score to par to lead the PGA Championship in 14 years. The 15 players separated by two shots made it the biggest logjam going into a weekend at a major since 2002.

There’s more traffic at Aronimink than Philadelphia’s Schuylkill Expressway at rush hour.

The difference between first and worst among 82 players who made the cut was only eight shots, unusually tight for any tournament, much less a major.

Smalley, in only his fifth major championship, overcame three straight bogeys after making the turn and closed with a birdie for a 1-under 69. McNealy, who has never been among the top 25 in any major through 36 holes, fell back with a pair of late bogeys in his round of 67.

They were at 4-under 136, the highest 36-hole score to par for co-leaders in the PGA since 2012 at Kiawah Island.

Chasing them? It’s a long list.

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