Berzin began his career as a track rider in the youth system of the Soviet team, under Alexandre Kuznetsov, joining when he was 14 years old. He won the Men's Amateur Individual Pursuit and the Team Amateur Pursuit at the 1990 UCI Track Cycling World Championships and gained silver in the Team Amateur Pursuit a year later. In 1992, Berzin wanted to switch to road racing in order to compete in the road race at the 1992 Olympics, but Kuznetsov refused, instead aiming to focus on the track events. Berzin subsequently left Russia and went to Italy with his girlfriend, Stella. There, he teamed up with Emanuele Bombini, a recently retired rider in the process of building a cycling team around former world champion Moreno Argentin with Mecair, an engineering company, as the main sponsor. The team, , was formed for 1993 and Berzin became part of it, alongside his friend Vladislav Bobrik.