Jockey Sam Waley-Cohen insists Long Run could be peaking at the right time ahead of his defence of the Betfred Cheltenham Gold Cup next Friday.
Although he has twice succumbed to Kauto Star this season, the amateur rider believes Nicky Henderson's seven-year-old gelding might be a different proposition at the Festival.
He said: "I think there is more, and better, to come from Long Run.
"To be mixing it with Kauto Star - I really hope he's over his fall and runs next Friday - already puts you on the doorstep of the greats."
Despite having given Long Run a fine ride in last season's Gold Cup, Waley-Cohen accepts there could have still been room for improvement.
He told the Telegraph: "I've probably watched that race and analysed it on video 100 times since, looking to see if there were things I could have done better - and there were.
"The dream is not just to ride the winner of the Gold Cup but to ride a horse who made the Gold Cup his own race.
"I honestly believe that like Kauto before him, Long Run could be a horse of a lifetime."