Jamie Spencer looked to have done everything right on David Simcock's Mr Owen, delivering his challenge late on as he surged past last year's winner Convey.
However, the David Elsworth-trained Master The World (16-1) was coming with a real rattle down the outside under Sean Levey.
As the post approached, Mr Owen veered markedly out to his right and into Master The World's path, with Levey seemingly forced to stop riding for a couple of strides.
Simcock explained: "He spooked at a shadow close home or else he would have kept straight."
The winning margin was a head, but the stewards felt the interference was enough to alter the result and reversed the placings.Master The World, the grey, and Mr Owen fight out the finish at Lingfield
Battle Of Marathon outran his 33-1 odds in third, but Aidan O'Brien's favourite, Clear Skies, never got involved.
Kevin Quinn, who part owns Master The World along with Chris Benham, commented: "Master The World came from nowhere and would have won but for the bump.
"He will come back for the Betway Easter Classic on Finals Day and would have a live chance based on that performance.
"Sean Levey gets on so well with him and having the right jockey on board massively helps. Sean wasn't on board last time and, because they have such a good connection, we probably shouldn't have run him. It is important to maintain those relationships when a horse and jockey get on so well.
"He is a great horse and Sean is a genius in the saddle. He's a top jockey and David Elsworth will continue to pick Sean where he can. The team have done a great job with him and credit where credit is due.
"Master The World did brilliantly for us last year, winning the Betfred Mile at Goodwood, and it was the same sort of race as today - he was mid-division and flew home. This is his biggest victory and we are delighted to be a part of it.
"That is a great way to start the year as we have plenty more irons in the fire and we will be out in force hopefully with more horses."
Benham added: "We adore the sport as owners and Master The World has been such a stalwart for us so we will continue investing in the sport and we would love another horse like this.
"He has been a bit unlucky this season. He has always got a race in him and we would have been happy with a place, but Sean said there would be pace on that's how it ended up. He finished really strongly and it was a great performance.
"We were a bit concerned early on about how far back he was, but it worked out perfectly.
"Once he finds his stride, he lengthens so well and he's just a great horse - we are just so pleased. This is why we want to be involved in the sport. It's nice to take part, but it's even better when you win."
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