Unheralded American Alex Smalley teed off with a one-stroke lead in Sunday's final round of the PGA Championship with a host of major winners trying to chase him down at Aronimink.

Top-ranked defending champion Scottie Scheffler fired a three-under par 67 to seize a share of the lead in Thursday's opening round of the PGA Championship.

The world No. 1 shot 67 to start his title defense at Aronimink Golf Club and has plenty of company.