Jon Rahm drives it far, which is what he did at No. 16 — 364 yards down the middle. A pitch up and a tap-in for birdie and now he's at 7-under, tied with Scottie Scheffler and Johnny Vegas for the lead. Rahm, by the way, is 5-under on his round. No one else is better than 3-under.

If you glance at the PGA Championship leaderboard, you will see a raft of familiar names – Scheffler, DeChambeau, McIlroy. But above them all sits one you might not recognize.