Tuanku continued the fine run of owners Box 41 when giving the 10-strong syndicate their 10th win of the season in the Chisholm Bookmakers Blaydon Nursery at Newcastle.
The 25-1 shot, trained by Mick Channon, stuck on well for Tadgh O'Shea to beat Tim Easterby's Welcome Return by a neck in the race, with stablemate Marning Star a short head away third.
"That's our second win on the trot. Dan Tucket won the big nursery at Newmarket on Saturday and now Tuanku has won today," said Tim Corby, Box 41's racing manager.
"Tadgh (O'Shea) is our lucky charm.
"Tuanku won a seller at Newmarket over seven last time and we bought him back for 10,500 guineas as we thought a mile might suit him better, so it was worth it and he's done it well.
"He's a rangy horse. He wants a bit of time and he'll be even better.
"We have eight horses in Box 41 and he's our 10th winner this year. This is our third year and we had seven winners last year.
"We are very proud of the achievements - it's fun and exciting for the 10 owners. This year we've had success at Listed and Group Three level, now two big nurseries and we haven't finished yet."
Kevin Ryan looks to have a smart prospect on his hands in the shape of Alexander Castle, who made a hugely promising debut in the European Breeders Fund Maiden Stakes.
The two-year-old son of Lemon Drop Kid was always travelling well under Neil Callan in the seven-furlong contest and was sitting on the heels of the leaders entering the final two furlongs.
Once Callan pressed the button the race was quickly over as Alexander Castle (5-1) swept into the lead and surged clear to win by three and a half lengths from Inspector Clouseau.
The 2-5 favourite Craigstown was a major disappointment, coming there with every chance under Kerrin McEvoy but folding tamely to finish fourth.
Alexander Castle has plenty of big-race entries later in the season, including the Champagne Stakes, Royal Lodge, Dewhurst and Racing Post Trophy.
Ryan said: "We have always thought a lot of him, I wouldn't have put him in the races I have if I didn't.
"He did it hands and heels today so he should come out of the race all right and we may give him another run before we go for something better but not necessarily so.
"There is improvement to come."