James Stewart #7

Of all the milestones James “Bubba” Stewart Jr. has reached, being the first African-American to dominate in motocross seems least notable - to him, anyway. He has a point, particularly when you consider everything the 23-year-old has accomplished. After racking up a record-breaking 11 American Motorcyclist Association Amateur National titles riding for Kawasaki Team Green, James was named 2002 Rookie of the Year in his debut pro season. In 2004, he won both the AMA 125 East Supercross Championship and the AMA 125 Motocross National Championship, and four years later, he became the second rider in history after Ricky Carmichael to complete a perfect motocross season - 24 wins in 24 races - after coming back from knee surgery, no less. He capped off his perfect season with the 2008 AMA Speed Athlete of the Year award.