King's most successful PDC World Championship was in the 2009, when he beat Mark Walsh and Dennis Smith before beating Barrie Bates 5–2 in the quarter-finals. This run set up a semi-final clash with Phil Taylor. King lost to Taylor 2–6. However, since then he has been knocked out in the second round every year to Co Stompé, Andy Smith and Michael van Gerwen in 2010, 2011 and 2012 respectively.