The Kentucky Derby Challenge Stakes was an English Thoroughbred horse race intended to become an annual race, but was run only once on 18 March 2009 at Kempton Park Racecourse in Sunbury-on-Thames, Surrey. Open to three-year-old horses, it was raced clockwise at a distance of nine furlongs (1+1⁄8 miles, app. 1800 metres) on Polytrack. No European-based horse has ever won the Kentucky Derby. The 2010 race was suspended and the 2009 winner, Mafaaz did not run in the Kentucky Derby, although he did run in the Blue Grass Stakes.