Maljaa had won similar events at Doncaster and over course and distance on his last two starts and stepped up again to defy a mark of 102 and 9st 10lb.
Jockey Dane O'Neill was always handy aboard the 11/4 favourite. He travelled strongly before striking the front inside the final furlong.
Confessional mounted a sustained challenge but Maljaa wouldn't be passed and went on to win by a neck.
Roger said: "The blinkers have helped him concerntrate and he is a hard horse to pass. That was impressive giving the second a stone and with 9st 10lb.
"He continues to improve and is versatile regarding ground. He's a very likable horse."
Shortly afterwards, Aljujalah made a winning debut in the 7f fillies' maiden at Newmarket.
The daughter of Exchange Rate travelled strongly before wearing down the long-time leader Gale Song to win going away by a length.
Roger added: "She is a lovely filly. She came from the breeze-ups and we have taken our time with her. I am not sure whether she will run again this season but she is a lovely prospect for next year."