Day One was all about Champions Day, and it was certainly the bookies lighting the torch after four Grade One's which included an unlikely winner in the Champion Hurdle.
A Plus Tard was the only winning favourite from the seven races on the card, who landed the Close Brothers Handicap Chase for Henry De Bromhead, and a first Festival winner for Rachael Blackmore, on a day where punters notably struggled.
You could argue the day got off to a flyer, when Ruby Walsh and Willie Mullins took the opener with the well backed Klassical Dream.
The Arkle looked a tough puzzle beforehand and was made easier when Glen Forsa unseated at the third, but still Duc Des Genievres - one of a number in with a claim beforehand, won at odds of 6/1.
The feature race was the story of the day however, and the bookmakers could have not fared better, with Buveur D'Air falling halfway round, Apple's Jade never a factor and Laurina missing out on a place in the final strides.
Espoir D'Allen - a 16/1 victor, collected the £450,000 prize.
It only got better for them when the shortest price favourite of the day failed to win, after Benie Des Dieux fell at the last under Ruby Walsh in the colours of Susannah Ricci in the Mares Hurdle, bringing back memories of his fall at the same flight on Annie Power three years ago in the same contest.
Day One belonged to the bookies alright.