Jockey Barry Geraghty claimed his second big-race win in a matter of days after Macs Joy took the Bewley's Hotels December Hurdle at Leopardstown.
It followed up Geraghty's success on Kicking King in the King George VI Chase at Kempton Park on Boxing Day.
The Jessica Harrington-trained five-year-old travelled nicely behind early leader Solerina before moving to challenge for the lead on the run to the last fence.
Although reigning Cheltenham champion hurdler Hardy Eustace tried to go with him, Macs Joy found a smart turn of foot to pull three lengths clear.
The Supreme Novices Hurdle winner Brave Inca ran on well to get the better of Hardy Eustace for second.
Macs Joy's win was some compensation for the trainer after Moscow Flyer missed his intended run on Monday with a respiratory infection.
"I am delighted," said Harrington. "The stable has been under a cloud and I have been walking on egg shells but this fellow has shown no signs of being under the weather.
"He jumped well throughout and he's galloped all the way to the line.
"We will probably go for the AIG Champion Hurdle in Leopardstown in January and we will also put him in the Tote Gold Trophy at Newbury the following month".
Bewley's December Hurdle, Leopardstown (2m)
1. Macs Joy (B Geraghty) 7-1
2. Brave Inca (BM Cash) 13-2
3. Hardy Eustace (C O'Dwyer) 6-4f
6 ran. Dist: 3, 2