Rogue Angel staged a late rally to snatch the spoils in the Guinness Kerry National Handicap Chase at Listowel.
The Mouse Morris-trained seven-year-old had made most of the running but seemed destined for a place at best when Urano shot to the front between the last two fences.
However, Ger Fox asked for one final effort from his willing mount and Rogue Angel (8-1) responded valiantly to collar Willie Mullins' charge by a short head.
Morris was also responsible for third home Rule The World, with Mullins' The Paparrazi Kid fourth.
It proved a wise decision by Morris to run Rogue Angel again quickly after finishing second on Sunday.
Morris said: "I honestly didn't know (if he had won the photo-finish) but I presumed I was second!
"Ger gave him a great ride and he jumped well today."
"He must have needed that bit of work on Sunday! He has always promised to win a big race but I wasn't quite expecting it today.
"The horse carried him (Ger Fox) the whole way today, but I thought Paul Townend's horse (Urano) was doing hand stands and galloping all over them turning in, but my horse stays all day."
Fox said: "To win the Kerry National is unbelievable. It's great for Mouse and for Gigginstown. It's brilliant for my career.
"It was just great to get a ride in the race.
"He ran a blinder the last day against Kylecrue and that was only over two and a half.
"He wants further and loves this type of ground. In fairness, he put his head down.
"I jumped him out smart and when he had his head in front he loved it. I was able to get breathers in and his jumping was brilliant and kept him in it all the way.
"I hung on to him as long as I could. When push came to shove, he had plenty left the more he put his head down.
"I've been with Noel Meade for the past two years and it was Noel that got me going and I've a lot to thank him for. I'm down to 3lb now and now things get harder, but it is great to win a race like this."
Lots Of Memories, who was backed down to 11-2 favouritism, suffered a fatal fall at the 12th fence when he brought down Owega Star, who also had to be put down.