Top sprinter Buffering's Brisbane Group One curse continued when he was beaten into third place by Hawkesbury galloper Famous Seamus in the BTC Cup at Doomben on Saturday.

Buffering has now had nine starts in Group One races in Brisbane without a win.

Famous Seamus ($21) gave jockey Ryan Wiggins a treble when they caused a major upset in beating beat Spirit Of Boom ($5.50) by a half length with three-quarters of a length to the favourite Buffering ($1.75).

It was the first Group One wins for both Wiggins and Famous Seamus but trainer Noel Mayfield-Smith believes it won't be the last this winter.

"I am just so excited for the horse, don't worry about me," Mayfield-Smith said.

"I have had an opinion of him right from day one and I brought him up here last year and he won a couple of races.

"But I don't think he was up to the best then but this year he is. I have had some top horses but he is up with them now."

Mayfield-Smith said Famous Seamus had suffered a black eye when beaten into fifth place at his first winter start in the Victory Stakes at Eagle Farm two weeks ago.

"He also wasn't suited by the shifty track that day and racing inside horses," Mayfield-Smith said.

"The conditions and the way the race was run suited him today."

Famous Seamus will press on to the remaining two legs of the Brisbane Group One sprint treble, the Doomben 10,000 on May 24 and the Stradbroke Handicap on June 7.

Wiggins, who had earlier won on Pretty Pins and Magic In Motion, will retain the rides in the two big sprints.

Mayfield-Smith rewarded him with the ride because Wiggins had worked a lot with Famous Seamus last year.

Buffering looked flat as he failed and it was obvious a long way from home he was struggling.

Jockey Damian Browne said Buffering had to be ridden along from the start.

"He just wasn't the same horse. I was at him to go with Tiger Tees - it just wasn't him at his best," Browne said.

Trainer Robert Heathcote said Buffering would press on to the Doomben 10,000 and then a decision would be made on whether he would tackle the Stradbroke.

"I am not panicking just yet," he said.

Michael Rodd was happy about the run of Spirit Of Boom who came from last.

"A great trial for the longer races," he said.

Rodd said the sectionals showed it was a slowly run first 600m, making it hard to get home from the back of the field.