 Although he signed a two-year contract, Riddle struggled to regularly feature in the Kingz side and only managed nine appearances with a return of two goals, both of which came away from home against Adelaide United and Brisbane Strikers.Better form would be found in the lower United States leagues with Riddle being a mainstay of the Laurie Calloway-coached Des Moines Menace side that would achieve an undefeated season in the 2002 USL Premier Development League competition.Riddle turned to the UK again in the hope of being signed by a Football League side but again struggled with the higher level of play and had short spells at Oxford City and Greenock Morton before being reunited with former Kingz teammates Marcus Stergiopoulos and Levent Osman at the Melbourne-based Altona Magic in the Victorian Premier League.