Rubuta ci gaba don wannan sakin layi - A cikin 1984 ya shiga cikin Gasar Cin Kofin Duniya ta Junior, inda kammala na huɗu ya ba shi matsayi a cikin ƙungiyar B ta ƙasa. A waccan shekarar, a cikin gasar slalom mai ban mamaki a San Siro, Milan, ya ba kowa mamaki ta hanyar doke kowane memba na ƙungiyar A. Bayan cin nasara uku a gasar cin kofin Turai, Tomba ya fara buga gasar cin kofin duniya a watan Disambar 1985 a Madonna di Campiglio, Italiya, kwanaki uku kafin ranar haihuwarsa ta goma sha tara. Watanni biyu bayan haka, a Åre, Sweden, ya ba da mamaki ga duniyar tseren kankara ta hanyar kammala na shida daga lambar lambar 62. Ya fara fitowa a kakar wasa ta gaba a Alta Badia, Italiya a watan Disamba na 1986, kuma daga baya a wannan hunturu ya lashe tagulla a cikin babban slalom a gasar zakarun duniya ta 1987
a Crans-Montana, Switzerland - lambar yabo ce kawai da kungiyar Italiya ta samu a wannan Gasar Cin Kofin Duniya.