The son of Oasis Dream got off the mark at Kempton ten days ago and he won again over a furlong further off a three pound higher mark.
He was settled in behind the leaders under Freddie Tylicki. He hit a flat spot when the leaders quickened but ran on strongly when switched to the outside.
He hit the front at the furlong marker before striding clear to win by two and a half lengths.
Roger said: "Andretti has improved with the switch to the all-weather and a step up in trip. He has done it nicely."