Gordon Elliott completed a famous Cheltenham treble with Tiger Roll in the JT McNamara National Hunt Chase.
Winner of the Triumph Hurdle over two miles in 2014, the Gigginstown House Stud-owned gelding was sent off at 16-1 for this four-mile test.
The seven-year-old was pulling rider Lisa O'Neill's arms out running down the hill and picked up from the home turn for a ready three-length success.
Missed Approach (50/1) was second ahead of Haymount (33/1) in third while a number of leading contenders disappointed, including Champers On Ice, who made a series of mistakes and was pulled up.
Elliott said: "I knew after three fences he was on a going day.
"He's a Triumph Hurdle winner and he's won here twice. He's never been moving so well at home.
"I can't believe it. To train three winners on the first day of Cheltenham. I thought if I had one this year I'd be delighted. It's a credit to the staff I have at home and the owners and the horses. It's brilliant."
O'Neill said: "It's surreal, to be honest. It's an overwhelming feeling. I was just hoping up the hill that there was nothing there to pass me.
"It's a good team effort and it's absolutely brilliant."