Dominant lived up to his name in the £150,000 Tattersalls Millions 3-Y-0 Cup.
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Roger Varian's charge pulled his chance away at Newbury last time but settled well here as Stentorian set a frenetic early pace.
The winner cruised past him over a furlong out and showed a smart turn of foot to quickly settle matters.
At the line Neil Callan's mount was five lengths clear of Malthouse (14-1) who just got the better of 11-4 favorite Questioning for the forecast spot.
Varian said: "I knew he was a very nice horse when he was an unlucky second at Sandown and he then found the ground too quick at Newbury, he never looked comfortable there.
"I think the key to this horse is some cut in the ground. The rain we had on Friday night made it good ground, he likes getting his toe in and on the back of that he looks an exciting horse with conditions to suit.
"I thought it was a good field going into the race and we'll have to see what the handicapper does now, he might put us out of handicaps.
"He's progressive, but I don't think he's a horse to run back quick, we'll keep him fresh."
Later on the card Dark Promise (5-1) completed a double for Varian and a fine treble for Callan when running out a cosy winner of the concluding Carter Cancer Centre EBF Fillies' Handicap.