Before Zagar went professional he played at the local amateur level with East York Soccer Club.

[8] On January 8, 2004, Zagar was transferred to division rivals the Rochester Raging Rhinos and signed to a two-year contract.

[9][10] During his tenure with Rochester he helped the team finish second in their division, which secured a postseason berth for the club.

In 2005, former teammate Hubert Busby Jr, was appointed the new head coach for the Toronto Lynx organization and brought back Zagar to the fold.

Zagar retired from professional soccer after Toronto's relegation and left holding every Lynx goalkeeping record, with the most wins (64), most shutouts (44.5), most saves (665), and most games played (174).