Australians competing in American motocross and supercross have created a major impact on the sport in this nation.Grand Prix racer Jeff Leisk lined up here in the mid-1980s. Chad Reed scored 61 race victories and four championships in AMA supercross and motocross. Michael Byrne and Brett Metcalfe were factory-backed racers...

After a brilliant summer-long fight with fierce rivals Mark Barnett, Jeff Ward and Ron Lechien, Johnny O’Mara snagged the 1983 AMA 125cc National Championship. One year later, O’Mara earned the 1984 AMA Supercross Series Championship. Along the way, O’Mara was also a member of Team USA, which in 1981 became...