A left-hander, he 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, he defeated Denmark's Per Laursen and Andy Jenkins before losing 3–4 in the third round to Phil Taylor, having led 3–2. 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.

Following this great run of form Alan attracted a new sponsor in Target Darts [2] and has just spent two months developing his own set of darts that he used for the very first time at the 2008 World Matchplay. In August 2008, Tabern claimed his second PDC Pro Tour victory in the Peach Tree Open in Atlanta by defeating Andy Hamilton 3–1 in the final and the next month he claimed another Players Championship win in Wales. This put him in the top 10 in the PDC Order of Merit for the first time in his career. Tabern played in the 2008 Grand Slam of Darts, where he was involved in the first televised nine-dart shootout after he and Hamilton had finished level on points and leg difference in their group. Tabern lost 265–169 in it, with only one of his 9 darts hitting treble 20, with three others in either five or one beds, contrasting with Hamilton's four treble 20s from six darts.

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