Vos first came to prominence as an 18-year-old in the 2008 Czech Open, getting to the final before losing to Dave Prins 6–4. His next major success came in the 2009 World Masters as a 19-year-old. He defeated such players as Ross Smith in the last 72, before knocking out the then-BDO World Champion Ted Hankey by 3 sets to 1 in the last 16. His run came to an end, however, as he was beaten 3–1 by eventual winner Martin Adams in the quarter-finals.

Vos has also played in European events on the PDC Pro Tour. His best result came in the 2011 PDC Youth Tour Event at Nuland, Netherlands on 18 June 2011 as he beat fellow countryman Michael van Gerwen 4–0 in the semi-finals before losing 4–2 to Joe Cullen.

In 2012, Vos earned a place in the Austrian Darts Open in Vienna by defeating Riccardo Pigliapoco and Toon Greebe in the European qualifier. He played Wayne Jones in the first round and beat the world number 14, 6–3, but then lost 6–4 to Justin Pipe in round two. He also qualified for the third European Darts Open with a win over Jerry Hendriks, and faced Pipe again in the first round in Düsseldorf, this time winning 6–3. He then beat fellow qualifier Tomas Seyler 6–4, before losing to compatriot Raymond van Barneveld 6–2 in the last 16. Vos played Dave Chisnall in the first round of the European Championship and was beaten 6–3, but exacted his revenge a month later by beating him 6–1 in the first round of the Dutch Darts Masters. A reverse of this scoreline followed in the second round, at the hands of Jamie Caven.

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