Mustajeer went three places better than last year by landing the £1 million Sky Bet Ebor Handicap at York on Saturday for Irish duo Colin Keane and Ger Lyons at odds of 16-1.
The former Owen Burrows-trained runner, who was bought for just £50,000 by new connections in 2017, sat prominently behind the John Gosden-trained front-runner Ben Vrackie and was in front fully three furlongs from home.
He had to show guts and determination to last out the 1m6f trip but did so gamely, with Red Galileo getting closest under Cieren Fallon for Godolphin.
Keane said: "It was a very good performance. It was pretty smooth and I probably got there a bit sooner than I wanted to. His aim at the start of the year was to be here and it's a brilliant training performance by Ger. I'm just grateful to be riding him."
Mustajeer was given an initial quote of 16-1 for the Melbourne Cup by Paddy Power and Betfair after his three-quarter-length success.
Desert Skyline ran a huge race for David Elsworth to take third, while Raymond Tusk came fourth after suffering severe trouble in running up the straight under Jamie Spencer.