Shantou Flyer's fine run in the Ultima Handicap Chase has seen him shorten for the big Aintree showpiece.
Shantou Flyer came from the pack and stayed on well to finish third in the Ultima Handicap Chase, behind winner Coo Star Sivola.
The 8 year old lived up to his name by flying towards the post as Coo Star Sivola wobbled slightly but the Nick Williams-trained gelding found something extra to hold off Shantou Flyer's challenge.
That hasn't stopped the bookies slashing the odds on the Sue Smith-trained gelding to win the Grand National though, with punters gambling on Shantou following up that impressive performance by winning the Aintree's big race.
His odds have been cut from 100/1 to 25/1 since the finale of the handicap earlier this afternoon, with 47% of bets placed on Shantou Flyer.
Owner Carl Hinchy has even suggested that Shantou Flyer could take up its entry in the Gold Cup on Friday and the odds have also crashed in for that race, with some firms offering 25/1 from 100/1.
It is understood that if he is okay when final declarations are made on Wednesday morning he will take his place up against the likes of Might Bite and Native River.
Other Cheltenham runners currently in the Grand National market are Vintage Clouds and Gold Present, who both also ran in the Ultima Handicap.
Vintage Clouds' odds have also come in for the National following a strong performance, moving from 50/1 to 25/1 while Gold Present was disappointing having pulled up in mid division.
Oddschecker spokesperson, George Elek: "Given the testing conditions at Cheltenham it would be no shock if the form from the Ultima translated into the gruelling slog at Aintree.
"Shantou Flyer gave a great account of himself and would go to the race with some great form behind him."