The second major of the season is here. The PGA Championship begins Thursday at Aronimink Golf Club in Newtown Square, Penn., with all eyes on the biggest names in golf. While this major tournament doesn’t get as much love as the other three, it is still a chance to build a golfer’s resume. Most years it becomes a shootout with players gunning for birdies down the stretch. The final round doesn’t lack drama. Here is a preview of the 110th PGA Championship. Storylines to follow Scheffler eyes repeat: Scottie Scheffler’s last two PGA Championships have been quite eventful. He won last year by six shots at Quail Hollow, and the year before he was arrested at Valhalla before his third round. He comes into this week after finishing second in his last three tournaments, including The Masters. It’s hard to not see him contending this week. McIlroy’s confidence: Rory McIlroy has seemed like a different player since winning his second straight Masters.…