Odds-on favourite Buveur d'Air has claimed the Champion Hurdle - the feature race on day one of the Cheltenham Festival.
The Barry Geraghty mount held off a stiff challenge from the Willie Mullins-trained Melon to come home a 6-to-4-on favourite to retain his title.
The Gordon Elliott-trained Mick Jazz was third at a price of 25-to1.
Willie Mullins and Ruby Walsh combined for their first winner at this year's Festival with 6-to-5-on favourite Footpad claiming the Arkle.
He recovered from a mistake on the back straight to hold off the challenge of Nicky Henderson's Brain Power who placed second at a price of 14-to-1.
The Tom George-trained Summerville Boy claimed the opening race of the festival - the Supreme Novices' Hurdle - at a price of 9-to-1.
The 6-year old finished just a neck ahead of 5-to-1 chance, Kalashnikov, with Mengli Khan in third under Jack Kennedy.
Favourite Getabird weakened in the run-in and was unplaced.
The 5-to-1 favourite Coo Star Sivola claimed the Ultima Handicap Chase - the third race on the opening day of the Cheltenham Festival.
The Nick Williams-trained horse just pipped 14-to-1 chance Shantou Flyer to the post.