The top jockey is bidding to win his third ever Grand National this afternoon at Aintree.
Walsh was first victorious with Papillon way back in 2000 before he triumphed five years later with Hedgehunter.
This time around he will be riding Rathvinden, who he describes as “a nimble little horse who has won over extreme and shorter distances.”
And if he is to record another memorable win he will have to get the better of last year’s winner Tiger Roll.
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Walsh is quietly hoping that one big difference to the horse this time around will stop it in its tracks of making history.
The Irishman told Paddy Power: “He’s bidding to become the first horse since Red Rum in the 1970s to win back-to-back Grand Nationals.
“He’s in outstanding form and looks a worthy favourite, but obviously because I’m riding against him I’m hoping that carrying 11st 5lbs this year will slow him down.”
The bookmakers are praying that Tiger Roll falls short among a maximum field of 40 at 5:15pm.
If the favourite wins this time around they are set to lose a jaw-dropping £200million.
That would be the highest ever payout on a horse by the bookies since the famous race’s inception back in 1839.
AP McCoy believes the horse has every chance of repeating last year’s feat, which will leave bookmakers increasingly concerned.
"If I could ride anything he's the one I would like to be on,” he said.
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Grand National 2019: Sir AP McCoy's tip ahead of race
The 44-year-old won the National back in 2010 with Don’t Push It.
“The slower the ground we get the more of a test it will be,” McCoy added.
“But he's definitely an improved horse from this time last year.
“When he won the Boyen Hurdle before Cheltenham it was such an impressive performance and there's no doubt he won the Cross Country race easier this year than last year.
“So he's got everything going for him. But trying to emulate Red Rum, it's been a long time.”
ITV will show the big race this afternoon but not after they simulated a run of the biggest race of the year on TV.
In weird footage that may have caught some punters out, ITV showed a virtual reality running of the Grand National.
And Rathvinden - one of the favourites for the actual race - was the winner!
He beat Tiger Roll into second place.