Gardner made his first three appearances in the Moto3 World Championship in 2014, twice as replacement for injured riders and once as a wild card entry, scoring one point.
For 2016, Gardner was due to compete in the Moto2 class with AGP Racing aboard a Suter alongside Federico Fuligni, but the team withdrew from the championship;[REF] he then moved to the FIM CEV Moto2 European Championship.