The heavily-supported Churchill got favourite-backers off to the perfect start on the final day of Royal Ascot with victory in the Chesham Stakes.
Aidan O'Brien's juvenile was only third on his racecourse debut at the Curragh last month, but was backed as if defeat was out of the question for his Berkshire assignment.
Always travelling well in the hands of Ryan Moore, the 8-11 market leader moved to the front with two furlongs still to run.
He started to wander a little when coming under pressure, and the late thrust of 25-1 shot Isomer made odds-on backers sweat, but Churchill passed the post half a length to the good.
Cunco, the first foal of the great Frankel and a winner on his Newbury debut, was far from disgraced in finishing third.
Moore said: "He's a big, powerful, beautiful horse.
"He travelled nice and smooth and when he got there (the front) he was very green, but he's a high-quality two-year-old.
"He's a bit of a baby, but he can only improve and he's one to look forward to."
