By David Hennessy

Paul Nicholls believes Oscar Whisky could bring the toughest test for Big Buck's in Thursday's Ladbrokes World Hurdle at Cheltenham.

"Big Buck's is in great order and comes good at this time of year."

"He keeps winning and he has beaten all of them except Oscar Whisky - I have a feeling he could be his toughest opponent to date.

"He's the obvious one, but he's going to have to be very good to beat Big Buck's and to stay very well.

"You'd have to say Big Buck's was my banker of the meeting as he's such a brilliant horse and I think he looks better in his coat than ever.

"Oscar Whisky will be a very interesting opponent as he has been impressive in his races at Cheltenham.

"He is bred to stay three miles so it's going to be very good race."