Including his youth career, he spent 14 years at Dynamo Dresden, winning the double in his penultimate season before German reunification, with one of his midfield teammates being Matthias Sammer.
After combining East and West German football in the summer of 1991, he would play with the team four consecutive years in the Bundesliga,[4] his competition debut coming on 14 September 1991, in a 3–0 home win against SG Wattenscheid 09.
After Dynamo's double relegation in 1995, Kmetsch spent three seasons with Hamburger SV, enjoying his best year in 1996–97 – 32 games, four goals – but his team could only rank 13th.
After being released in early 2010, he held talks with TSV Germania Windeck and Bayer Leverkusen II to join Heiko Scholz's coaching staff.
[5] Kmetsch gained two caps for Germany, his debut coming on 10 September 1997, in a 1998 FIFA World Cup qualifier against Armenia, in Dortmund: at half-time, with the score at 0–0 (eventually 4–0), he was replaced by another débutant, Lars Ricken.