Zrno began his professional wrestling career in 1973. He worked in many Germany promotions throughout his career. In 1979, he made his debut in Japan for International Wrestling Enterprise.[4]
On July 17, 1987, Zrno won the CWA World Middleweight Championship defeating Steve Wright in Vienna, Austria. He dropped the title back to Wright on December 2, 1987.[5]
On November 23, 1988, Zrno and Tony St. Clair became the first CWA World Tag Team Champions. They held the titles for over a year until dropping them to Dave Finlay and Marty Jones on June 23, 1990. Zrno teamed up with Franz Schurmann to win back the titles from Finlay and Jones. They held them until December 21, 1991, losing to Chris Benoit and David Taylor. On July 18, 1993 Zrno teamed with David Taylor to defeat Mad Bull Buster and Larry Cameron for the titles. They dropped them back to Buster and Cameron on October 24, 1993.
By the end of 1993, Zrno took a hiatus from wrestling.
In 1997, Zrno returned to the wrestling and Catch Wrestling Association. He made his debut that year for Verband der Berufsringer in Germany. Catch folded in 1999 and Zrno retired from wrestling in 2000.
Zrno, returned for one night wrestling Karsten Kretschmer at Verband der Berufsringer in a no-contest.[6]