Rory McIlroy laid the foundations for a two-stroke victory in the Deutsche Bank Championship over England's Paul Casey with a bewitching front nine performance, sinking five birdies to be five under at the turn

With six birdies, two bogeys and an eagle, the reigning Masters and US Open champion Jordan Spieth finished 36 holes on 11-under 133 to join fellow Americans Bill Haas and Jimmy Walker atop the leaderboard in the Hero World Challenge.

Indian ace Anirban Lahiri did not offer excuses for his disappointing debut in the biennial Presidents Cup.