NEWTOWN SQUARE, Pa. — This was a quintessential Scottie Scheffler day. Difficult as it may be to fathom, you might have forgotten he was in the field Thursday as the PGA Championship was carrying on through its opening round at Aronimink Golf Club. How could you forget that the No. 1-ranked player in the world for the past three years, and a player who has carried that top spot into the past 12 major championships, was in the field? Preposterous, right? But Scheffler was playing in the third-to-