When Saffie Joseph, Jr. arrived in the U.S. from Barbados in 2011, the then 24-year-old didn't come here to be just another trainer. He wanted what racing in Barbados could never offer him, a chance to prosper on a big stage and to become one of the top trainers in the sport. Some nine years later, he's on his way, capturing training titles at Gulfstream and Gulfstream Park West and winning graded stakes with horses like GI Pennsylvania Derby winner Math Wizard (Algorithms). This year alone, he's won six stakes,...