Mitchell won the England Classic and Swiss Open in 2009 which helped him qualify for the 2010 BDO World Championship as the 14th seed. However, he lost in the first round 3–2 to Northern Ireland's Daryl Gurney. Mitchell retained his Swiss Open title in 2010 and also won the Center Parcs Masters, and qualified for 2011 BDO World Championship as the 15th seed, however he was beaten in the first round 3–0 by Dutch qualifier Jan Dekker.