 Nyorai kupfuurira kweiyi ndima - Mikkelsen akava nyanzvi muna 1979, uye akatamba chete paWorld Snooker Championship mumwaka wake wokutanga mitatu. Akarasikirwa mumutambo wekutanga wekukwanisa nguva dzose; 79 kuna Roy Amdor muna 1980, 49 kuna Jimmy White muna 1981, uye 69 kuna Colin Roscoe muna 1982. Mushure mokunge vasina kukwikwidza munguva ye1982-83 snooker mwaka, Mikkelsen akasvika pamutambo wechitatu wekutsvaga we1984 World Snooker Championship nekukunda Paul Medati naFrank Jonik vasati vabviswa 3-10 naWillie Thorne. Mumutambo unokodzera we 1985 World Snooker Championship, Mikkelsen akaunganidza kuputsa kwe132, asi akarasikirwa ne9 10 kuna Malcolm Bradley. 