 Complete the following phrase:  Jackson won his first major medal, a silver, in the 110 m hurdles, aged nineteen at the 1986 Commonwealth Games. He soon established himself on the global scene, taking bronze at the 1987 World Championships in Athletics and a silver medal at the 1988 Summer Olympics. After winning another silver in the 60 metres hurdles at the 1989 IAAF World Indoor Championships, he won European and 