British star Casey, who won the Matchplay in 2006, goes into the final round of the BMWPGAChampionship with a three-shot lead over Dane Soren Kjeldsen.
Stephen Gallacher, a former touring professional at the course, will hope to continue the form he showed in finishing fourth in the BMWPGAChampionship at Wentworth.
The BMW International Open kicks off a series of lucrative events that includes the British Open, the PGAChampionship and runs through the Ryder Cup 19-21 September.