A congested field reflects a tougher-than-expected test at Aronimink Golf Club with most of the world’s top players still in contention at the PGA Championship . Defending champion Scottie Scheffler is one of seven players in a share of the lead at three-under after round one, with Martin Kaymer in surprising form, too, 16 years on from his breakthrough success at the event. Patrick Reed, Shane Lowry and Xander Schauffele are among the major champions right in touch just a shot back, but Rory McIlroy and Bryson DeChambeau have plenty to do after disappointing starts in Philadelphia. The Masters champion finished with four consecutive bogeys to finish seven shots behind the leaders, with LIV Golf’s DeChambeau two shots further back and likely out of contention already. Here’s everything you need to know ahead of round two at Aronimink.…