On May 15, 2003 at the Canadian Professional Soccer League press conference the Hamilton Thunder announced Wilde as the new head coach for the 2003 season.

[1] After leading the Thunder to a six-game undefeated streak, Wilde resigned from his post as head coach after a team meeting with Hamilton owner Italo Ferrari on July 22, 2003.

[5] Under the guidance of Wilde the club won the CSL Cup with a 2-1 victory over Vaughan Shooters, and finished second in the Western Conference.

On February 26, 2006 the Toronto Lynx announced the return of Duncan Wilde as head coach for the 2006 USL season.

[6] Though the Lynx failed to qualify for the play-offs, Wilde achieved a 10-game team record undefeated streak at home and reached the finals of the Open Canada Cup, but lost the match 2–0 against Ottawa St. Anthony Italia.