 He started his professional career in 1994–95, and made his first division debut as a second-half substitute in the club's 0–1 loss at Eintracht Frankfurt, on 7 October 1994.It would be his sole appearance of the campaign, and he amassed only four more in the following season, although he netted in another away fixture, a 3–0 success against SC Freiburg, on 13 April 1996.Schroth eventually became a regular for KSC, making his UEFA Cup debut in a 0–1 loss at FC Rapid Bucharest (one minute played), and appearing in all the matches during 1997–98, scoring six goals, as Karlsruhe would eventually be relegated.