Star apprentice Connor King registered his 35th victory of the campaign on Cash Or Casualty in the Exchange Inn Ballybunion & Kevin Brodericks Bar Listowel Handicap.
It was a thrilling finish to the seven-furlong contest as three flashed past the post together.
However, backers of the top weight Ondeafears, looking to repeat the victory of last year, were left wondering what might have been as Shane Foley's mount repeatedly found trouble in running before flashing home for fourth.
Footprint was in front inside the final furlong before Cash Or Casualty and Canary Row both made late bids, but it was King on Damian English's 16-1 chance who prevailed by a neck.
"For a while I thought he was a quick ground horse but Rory Cleary said that six furlongs on soft ground might suit him," said English.
"He seems to handle any type of ground and he's tough and hardy. He's so hardy as he was lame last week. The farrier James Stafford did a great job with him.
"He's in again on Friday over nine furlongs. It's a big pot so it might be worth a go."
Mastercraftsman has made a good start to his stallion career and another of his offspring, Craftsman, opened his account in the Listowel Arms Median Auction Maiden at the Kerry venue.
Second on debut to a rival with two previous runs under his belt, the Aidan O'Brien-trained youngster was sent off the 2-5 favourite to go one better.
While he always looked likely to win under Joseph O'Brien, he was just workmanlike in beating The Panhandler by two lengths but does hold entries in the Middle Park and Dewhurst at Newmarket next month.
Joseph O'Brien said: "He's a grand horse and he had a nice run first time out.
"He shows plenty of pace so the trip was no problem. He handles an ease but that was very testing,"
The O'Briens doubled up by taking the feature Flat race of the afternoon, the Edmund & Josie Whelan Memorial Listowel Stakes, with Eye Of The Storm.
The three-year-old looked set for a big campaign earlier on this season after finishing second to Sugar Boy in the Sandown Classic Trial but he was not seen again until Galway last week.
He was surprisingly turned over at odds-on by the gallant Missunited that day but as soon as Joseph O'Brien asked him to take up the running from Inis Meain fully two furlongs out, the result was never in any doubt.
The 10-11 favourite galloped through the mud to win by two and a half lengths and could be an interesting contender for the Long Distance Cup at Ascot on Champions Day, for which he is entered.
Eye Of The Storm only has one eye after an accident as a foal.
O'Brien jnr said: "He didn't do things right at Galway. It was his first run back but he ran off the first bend which cost us six lengths and but for that we would probably have won.
"He travelled nicely today and quickened very well. The plan was to try and get him relaxed and let things happen after that.
"It was his first time going left-handed which was a little bit of a concern, too. He probably wants nicer ground."