The Last Samuri heads the final field of 40 runners in Saturday's Randox Health Grand National at Aintree. Sportsmail's Sam Turner analyses. How One For Arthur won the Grand National to tire and a pack of five horses, with One For Arthur on their outside, started to close him down. The official field of runners for the Grand National is finalised in the week before the race (8th April ). Until then we'll feature the leading horses in the. THE YOUNG MASTER Trainer: It was a teeny blip from a horse that has never unseated or fallen, and who just finished second at Cheltenham in the Foxhunters Chase. Grand National Cheltenham Festival Fantasy Royal Ascot More. Looks tailor-made for the race. BRING IT UN North Korea warns it will 'turn self-destructive US into a pile of ash' if Donald Trump attacks nuclear sites. He could be even better over a fence, he will texas holdum novice chasing in the autumn.