Paul Casey leads after 54 holes at Deutsche Bank Championship; Rory McIlroy six shots behind

England's Paul Casey will head into the final round of the Deutsche Bank Championship with a three-shot lead after carding a third straight 66 on Sunday.

Casey, who started Sunday's third round one shot behind leader Kevin Chappell at TPC Boston, was one under through four after a bogey on three, but reeled off three birdies in a row from the fifth and added another on 16 before closing with a brilliant eagle at the par-five 18th.