Professional was Zberg 1996. After every season with the Italian teams Team Carrera Jeans, Mercatone Uno and the Post Swiss team came Zberg 1999 Rabobank team. As of 2003, he went together with his older brother beat Zberg for the team Gerolsteiner. One of his greatest successes was his second place finish at the world road championship in Verona in 1999. A year later he won the title at the Swiss road championships. He also won two stages of the 1998 Tour of Spain as well as the one-day race Milan -Turin in 1998 and Around the Henninger Tower in 2001, stages of the Tour de Suisse, Tirreno- Adriatico, and at the Tour of Austria. 2006 succeeded Zberg then his first Pro Tour victory on the last leg of the voyage stage race Paris-Nice. In 2008 he repeated his success at the Swiss road championships. After a crash in the Tour de l' Ain Zberg tratt back on 14 August 2009.
In the course of the investigation, the special commission of the Vienna Federal Criminal Police Office ( BKA) on the case of after the 2008 Tour de France doping convicted Bernhard Kohl was Zberg of carbon, whose manager Stefan Matschiner and Gernot Winterauer, Matschiners henchmen, heavily loaded. It should have been carried Winterauer passed 24,000 international doses of EPO derivative Dynepo in German Rosenheim according to their matching statement in the spring of 2008. In part confession, which took off in 2010 Matschiner proceedings against him doping process, Zberg was named by name as buyers of illegal means.
Markus Zberg is athlete ambassador of development organization Right to Play.
Apart from him and his brother beat his sister Luzia Zberg was a successful cyclist.
- Tell a stage Grand Prix
- A stage in Tour of Poland
- Two stages of the Vuelta a España
- Tour de Berne
- Reservoir Tour Klingnau
- A stage in the Tour de Suisse
- A stage Settimana Bergamasca
- Vice World Champion - Road Race
- Milan -Turin
- A stage of Bank Austria Tour
- Around the Henninger Tower
- A stage of Tirreno- Adriatico
- A stage of Paris-Nice
- Swiss Champion - Road Race