A left-hander, Tabern made his PDC World Championship debut in 2005 with a surprising win over Alex Roy. He was beaten in the second round by Mark Dudbridge. Tabern reached the quarter-finals of the 2007 PDC World Darts Championship, where he was beaten 0–5 by eventual winner Raymond van Barneveld. In the 2008 World Championship, Tabern defeated Denmark's Per Laursen and Andy Jenkins, before losing 3–4 in the third round to Phil Taylor. Tabern caused a major shock in the 2008 Las Vegas Desert Classic by beating No. 2 seed and reigning champion van Barneveld 8–4 in the second round. In the 2008 World Matchplay,Tabern reached the quarter-finals, knocking out current World Champion John Part before losing to Dennis Priestley.