Mar 4 2018: William Seitz DNF'ed at the Men Junior 17-18 Race at the Tour of the Southern Highlands - Road Race in a group sprint

Mar 3 2018: William Seitz places 50th at the Men Junior 17-18 JM Race at the Tour of the Southern Highlands - TT in a group sprint

Mar 3 2018: William Seitz places 47th at the Men Junior 17-18 Race at the Tour of the Southern Highlands - Circuit Race in a group sprint