Scott Brash and his bay gelding Hello Sanctos entered the Spruce Meadows ‘Masters’ in 2015 on the cusp of history.After back-to-back wins at two major show jumping competitions — in Geneva, Switzerland, and Aachen, Germany — the 29-year-old was one victory from becoming the first rider to capture the Rolex Grand Slam of Show Jumping, and scooping a €1 million ($1.2 million) bonus.Just before the finish, Hello Sanctos brushed a pole but that was as bad as it got as the pair jumped a clean round inside the time limit to win a third straight major, claiming the sport’s most coveted prize.“It’s difficult enough to win one of those Grands Prix in your lifetime, let alone three in a row,” Brash told The Athletic.The Grand Slam of Show Jumping began in 2013, when organizers for Aachen, Spruce Meadows in Calgary, Canada and Geneva, approached Rolex to create the ultimate challenge for the world’s best riders, modeled on the golf and tennis majors. The Dutch Masters in ‘s-Hertogenbosch, Netherlands, was added to the roster in 2018.Any rider who wins two events in a row gets a €500,000 ($580,000) bonus, while three consecutive victories secures the Grand Slam, plus a €1 million ($1.2 million) payout. Winning four straight majors nets a €2 million ($2.4 million) bonus. The victories must be consecutive but don’t have to be in the same calendar year.