TROON, Scotland — Two reasons to pick Dustin Johnson to win the 145th Open Championship:
1. He’s American, and the last six players to win the Open at Troon, dating back to Arnold Palmer in 1962, have been all been Yanks.
2. Coming off victories at the U.S. Open and WGC Bridgestone Invitational, he’s simply playing better than anyone else, including the artists formerly known as the Big Three: Jason Day, Jordan Spieth and Rory McIlroy.
That trio is now a quartet. After a series of near misses at majors, Johnson, with his breakthrough at Oakmont last month, has muscled his way into the top echelon, bumping…