 Nyorai kupfuurira kweiyi ndima - Mikkelsen akava nyanzvi muna 1979, uye akatamba chete paWorld Snooker Championship mumwaka wake wokutanga mitatu. Akarasikirwa mumutambo wokutanga wokutanga nguva dzose; 79 kuna Roy Amdor muna 1980, 49 kuna Jimmy White muna 1981, uye 69 kuna Colin Roscoe muna 1982. Mushure mokunge asina kukwikwidza mumwaka we snooker wa1982-83, Mikkelsen akasvika munharaunda yechitatu yekukwanisa ye 1984 World Snooker Championshipnevakundi pamusoro paPaul Medati naFrank Jonik vasati vabviswa 310 naWillie Thorne. Mumutambo unokodzera we 1985 World Snooker Championship, Mikkelsen akaunganidza kuputsa kwe132, asi akarasikirwa ne9 10 kuna Malcolm Bradley. 