Something stunning was about to happen as the two colts bounded into the deep stretch, the one in front hitting the ground with a wobble, the one giving chase gathering strength with every stride. Either Bodemeister was going to give the trainer Bob Baffert, fresh off a heart attack, his fourth Kentucky Derby victory, or I’ll Have Another was going to give an anonymous jockey, Mario Gutierrez, one of the most unlikely victories in the 138 runnings of America’s greatest horse race. For a mile and an eighth, Bodemeister had been breathtaking. He had come to Churchill Downs as the undisputed king of speed after leading every step of the way in the Arkansas Derby. It was why bettors in a record crowd of more than 165,000 had made him the 4-1 favorite. But the 3-year-old colt was taking on history — he had not raced as a 2-year-old, and the last time a late starter had won the Derby was a horse named Apollo in 1882. As soon as Mike Smith, his Hall of Fame rider, shot Bodemeister ...