De Ruiter played very few tournaments during early stages of 2008 due to vertigo and quit darts for three months until he came back to the game. He recovered and returned to the sport during the latter stages of the year to participate in the 2008 Grand Slam of Darts. De Ruiter was drawn in a tough group consisting of James Wade, Adrian Lewis and Denis Ovens. He only won a single leg during the three group matches and suffered two whitewash losses to Lewis and Ovens. De Ruiter then failed to qualify for the 2009 BDO World Darts Championship and also for the last 16 stage of the World Masters.