Premier League after Wayne Mardle withdrew from the competition. Klaasen qualified for the World Matchplay in Blackpool but lost 10–8 to Ronnie Baxter in the first round. Klaasen lost in the first round of the 2010 World Championship losing 3–1 to Welshman Barrie Bates. He then reached the quarter finals of the 2010 World Matchplay, beating Mervyn King and Gary Anderson before losing to Simon Whitlock. Klaasen reached the second round of the 2012 World Championship with a 3–1 win over Peter Wright, but was beaten 0–4 by James Wade in the second round. His best result of 2012 was in reaching the quarter-finals of the third UK Open Qualifier in March where he lost 4–6 to Mark Jones. At the UK Open itself he was defeated in the last 64 by Raymond van Barneveld 3–9. After revelations emerged with regard to Klaasen's personal life detailed below he did not play again in the rest of 2012, which included missing the 2013 World Championship. 2013 Klaasen returned to darts in January 2013 by qualifying for the first European Tour event of the year, the UK Darts Masters, with a 6–2 win over Carlos Rodríguez. He lost to Michael van Gerwen 5–6 in the first round. In May, Klaasen reached his first PDC final since November 2007 at the fourth Players Championship by beating the likes of Mervyn King and Gary Anderson. He averaged 103 in the final against Jamie Caven but lost 4–6 with his opponent averaging almost 111. At the UK Open he beat Gareth Pass, Ross Smith and Stuart Kellett to reach the last 16 for the first time since 2008. Klaasen played Ronnie Baxter and lost 7–9. He beat Wes Newton 6–4 and Justin Pipe 10–6 to advance to the quarter-finals of the European Championship, where he was defeated 7–10 by Michael van Gerwen. In the first round of the World Matchplay he came back from 3–8 down against Simon Whitlock to trail only 7–9, but lost the next leg to fall short of a successful fightback. Klaasen was outplayed by Gary Anderson in the first round of the World Grand Prix as the Scotsman did not give Klaasen one dart at a leg winning double in a 2–0 in sets ten minute match. In the double-start event Anderson averaged 104.86, almost 40 points ahead of Klaasen's 67.22. Klaasen knocked out number two seed Dave Chisnall 6–4