 Complete the following phrase:  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 Mens 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 