 Nyorai kupfuurira kweiyi ndima - Berger akabatana nechikwata chenyika chebiathlon muna 2001. Munguva ye2004 Biathlon World Championships muOberhof, Germany, akahwina menduru dzesirivheri mumakiromita gumi nemashanu ekutanga uye 4 × 7.5 km relay. Berger akahwinawo menduru mbiri dzegoridhe mumakwikwi epasi rose emauto gore rimwe chetero kuyambuka nyika uye patrol. Berger akapedza wechishanu mu2004 World Cup, uye akahwina menduru dzegoridhe dzinoverengeka kubva kuNorway Biathlon Championships. Pa2007 Biathlon World ChampionshipsmuRasen-Antholz, Italy, Berger aive chikamu chechikwata cheNorway chakakunda sirivheri mu4 × 7.5 km relay. Mushure memakwikwi akati wandei anoodza moyo, kunyanya nekuda kwekupfura kusagadzikana, Berger akakandirwa kunze kwechikwata chenyika cheNorway pamberi pemwaka wa2008 2009. Akatsiva izvi nokudzorera kukunda kwemikombe yenyika mbiri mumitambo yekumhanyisa, sirivha muWorld Championship sprint, uye yakabatsira kugoridhe mumutambo wevarume. Aionekwa somumhanyi anomhanya kupfuura vamwe vose mumakwikwi aya, asi kusanyatsopfura kwaaiita kwaiita kuti asabudirira uye akunde kakawanda. 