Casey had birdies on three of the four par 3s of the Doha Country Club course en route to a third-round, 6-under-par 66 while Dredge overcame a double bogey for a 70 and a 54-hole total of 10-under 206.
They are one stroke ahead of Lee Westwood, who shot 70 Saturday, while Robert Karlsson (70) and second-round leader Brett Rumford (73) are in fourth at 8-under.
Casey started his move with a 2 at the par-3 third hole and quickly added a birdie at the fourth. He collected consecutive birdies on Nos. 9-11 and went to 6-under on the day with another 2 at the par-3 13th. Casey answered a bogey at 15 with a birdie at the par-3 No. 17.
Dredge, who started the day in second, jumped into the lead with birdies at Nos. 2 and 3 but gave back both strokes with a 6 at the par-4 fifth hole. He added birdies at 7 and 9 but bogeyed No. 13 before a birdie at 17 returned him to 2-under for the round.
Copyright 2010 United Press International.
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