De Vos won the 2015 BDO World Trophy in Manchester. He started his run beating Rick Hofstra 6–3, and then thrashing American Jim Widmayer 6–0. On the final day, he defeated Wesley Harms in the quarter-finals, Mark McGeeney in what was a close game in the Semis, and won a last-leg decider in a classic final against Jeffrey de Graaf 10–9. This win qualified him for the 2015 Grand Slam of Darts where he exited at the group stage with defeats to Robert Thornton and Terry Jenkins. However, he still had one game to play which was against Jonny Clayton, where he threatened the world record average, finishing the match with an average of 113.86