In 1984 he took part in the Junior World Championships, where a fourth-place finish won him a position on the national B team. That year, in an exhibition parallel slalom competition in San Siro, Milan, he surprised everyone by beating every member of the A team. After three wins on the Europa Cup circuit, Tomba made his World Cup debut in December 1985 at Madonna di Campiglio, Italy, three days before his nineteenth birthday. Two months later, in Åre, Sweden, he surprised the skiing world by finishing sixth from a bib number of 62. His first podium came the following season in Alta Badia, Italy in December 1986, and later that winter he won bronze in the giant slalom at the 1987 World Championships in Crans-Montana, Switzerland - the only medal won by the Italian team at that World Championships.