Aidan O'Brien's Chamonix, still engaged in the Ladbrokes St Leger at Doncaster on Saturday, showed stamina in abundance to win the Listed Ardilaun Hotel Oyster Stakes at Galway.
Jockey Joseph O'Brien, who was completing a treble on the card, became involved in a barging match with Shane Foley on Macbeth at halfway but once he secured the position he wanted behind Eternal Bounty, O'Brien kicked on some way out on the 5-2 second-favourite.
It looked hard work in the rain-affected ground and having just his third run Chamonix still appeared a little green, but he eventually knuckled down to the task to beat stable companion Demurely by six lengths.
"He's tough and he tries. He'd be better on nicer ground. 'Dusty' (Foley) wanted to keep me in a bit tight (down the back straight) but I found plenty of room. He stayed on well and he is tough," said O'Brien jnr.
Eye Of The Storm (3-1) added even more strength to the Ballydoyle juvenile division when making an impressive start to his career in the Donnelly's Of Barna EBF Maiden.
The Galileo colt moved up from his position tracking the leaders to seize the initiative rounding the home turn, and he stayed on takingly to beat Pearl Of Africa by two and three-quarter lengths.
O'Brien jnr said: "He won nicely and I hope he'll be a bit better on nicer ground. He's a lovely horse."
O'Brien was also in the winner's enclosure following the Paschal Corrigan Memorial Handicap after driving Cairdiuil (3-1 favourite) to a clear-cut success.