 He made his professional debut on 24 October 1981 in a 0–2 away loss against SV Werder Bremen, becoming an automatic first-choice from his second season onwards.The tail-end of Zorc's career saw also his greatest successes, as Dortmund were twice crowned national champions, as well as winning the 1996–97 UEFA Champions League and the Intercontinental Cup.He scored in double digits in seven seasons, including 15 apiece from 1994 to 1996.