Pakistan, May 13 -- Top-ranked defending champion Scottie Scheffler and a host of world-class rivals took their first practice rounds on Monday at Aronimink ahead of the 108th PGA Championship, which tees off Thursday.

A formidable 7,394-yard, par-70 course awaits in the year's second major tournament with 174 bunkers scattered across the layout, which features undulating greens at lightning-fast speeds.

"Right now it's about getting to know the golf course, where the pin locations are going to be, where these pins you attack, where are the ones you layoff of, stuff like that - what are the deceiving shots," three-time major winner Jordan Spieth said.

Scheffler worked with swing coach Randy Smith and putting coach Phil Kenyon before hi...