NEWTOWN SQUARE, Pa. — The season’s second major is nearly upon us, and might a clash of the game’s best be on tap? Scottie Scheffler is the world No. 1 and defending his title at the PGA Championship, coming in off a historic streak of three straight runner-ups —the kind of run that would satisfy many pros, but not him. Of course, his solo second at the Masters was behind Rory McIlroy, and the world No. 2 is rested and feeling positive . But all eyes on the Northern Irishman will be peering down at his feet come Thursday, as a nagging foot ailment has affected his prep at Aronimink Golf Club. He will play the first two rounds alongside Jon Rahm and Jordan Spieth, a starry pairing that will draw plenty of Philly fans. Spieth is teeing it up in his 10th PGA with a chance to complete the career Grand Slam, not that he needs reminding . Rahm is good to go in future Ryder Cups but wants to get his major game back on track first. Who else could surprise?…