SARATOGA SPRINGS, NY--For the last dozen or so years, the competition for the training title at Saratoga Race Course has become the Todd and Chad Show. The next round of the now-annual summer showdown of heavyweights in upstate New York between Todd Pletcher and Chad Brown begins Thursday, the opening day of the 154th season of racing at Saratoga. Pletcher, 55, the all-time leader, will seek his 15th championship, named to honor the late great H. Allen Jerkens. Brown, 43, who just completed a record-smashing Belmont spring/summer season, is seeking...