By Racinguk.com staff
Just four runners went to post for the feature event in Wiltshire, with the Roger Charlton-trained Ayrad a 4-1 shot under top weight.
Atzeni sent the six-year-old straight to the lead and while 5-4 favourite Almoreb travelled smoothly into contention, Charlton's charge found another gear inside the final furlong of the mile-and-a-quarter contest to score by four and a half lengths.
The Italian-born rider had got the day off to a flying start aboard Ace Ventura in the PKF Francis Clark EBF Novice Stakes, but odds-on backers were made to sweat.
Roger Varian's 8-11 favourite was all out to hold Mandalayan at bay by a head, with Regular Income a close-up third.
Varian said: "Ace Ventura is by a sprinter in Mayson, but he certainly improved with age, and he is a half-brother to Alessandro Volta, who finished fourth in the Irish Derby, so you would think the best is yet to come.
"His physical make-up would reflect that as well and he will be a lovely horse as a three-year-old."
Varian and Atzeni swiftly doubled up in more straightforward fashion as Jamil (4-1) passed the post a shade over two lengths clear of Dance Emperor to make a successful debut in the Become A Wiltshire Freemason EBF Novice Stakes.
"Jamil has worked nicely and he was ready to make a start, although this was quite a taking performance first time out," the trainer told his website, www.varianstable.com.
"The race possibly fell apart a little, but he was far superior to his rivals and he, too, should make-up into a very nice horse next year."
Trainer David Evans and champion jockey Jim Crowley combined to land the Bathwick Tyres Conditions Stakes with 15-2 shot Mr Top Hat.
John Spearing's Clear Spring was a 6-1 winner of the Corintech Ruby Anniversary Handicap under Shane Kelly, while the concluding Bathwick Tyres Handicap went to 14-1 shot Quothquan, trained by Michael Madgwick and ridden by apprentice George Wood.