Joseph O'Brien feels Leading Light makes his job look easy as the colt attempts to maintain his unbeaten run this season in the Palmerstown House Estate Irish St Leger at the Curragh.
The four-year-old, who won the Ladbrokes St Leger at Doncaster last year, stepped up to take the Ascot Gold Cup in June but showed he still had the pace to win over shorter distances when claiming a trial for this race over the mile-and-three-quarters trip last month.
In 10 career races he has only lost twice - on his debut and in the Prix de l'Arc de Triomphe last October - and will be a red-hot favourite to give Aidan O'Brien his first win in the race since Septimus in 2008.
"He seems to have come out of his prep race at the Curragh really well," said Joseph O'Brien.
"He idled in front that day but always does and won nicely. Ground or trip is not a massive problem for him.
"He is an uncomplicated horse and I can ride him handy or take my time and that makes my job very easy."
Leading Light had Royal Diamond back in second in the Leger Trial on August 24 and Johnny Murtagh's veteran meets his conqueror on 5lb worse terms.
Nevertheless, he won the race back in 2012 for Tommy Carmody and also struck at Ascot on Champions Day last season.
"Royal Diamond had a good run in the Leger Trial and I've been happy with him since," said Murtagh.
"He's won the Irish St Leger before and he seems to like the Curragh.
"We're really looking forward to it."
"He is an uncomplicated horse and I can ride him handy or take my time and that makes my job very easy" - Joseph O'Brien on Leading Light
Third behind Royal Diamond two years ago was Tom Dascombe's Brown Panther, who failed to get home in the Gold Cup at Ascot.
Dascombe said: "I'm very, very happy with him, but it looks a good race.
"We went for this two years ago thinking he was a certainty but he got beaten.
"We put that down to there being no pace. What he wants is a good gallop and something to aim at.
"The ground isn't a worry. It certainly wasn't the reason he was beaten at Ascot, he just didn't stay the trip there.
"It's a competitive race, as it should be for a Group One, but we go there with a chance.
"He's had a hard enough campaign. He's had five Group races, won two of them and been in the first four in the others.
"We just thought we'd freshen him up and have a really good crack at this."
Brown Panther is owned by former footballer Michael Owen, who told RTE Sport: "I think he's a better horse this season than he's ever been.
"He won a couple of Group races around Chester and Sandown and then he went and ran a great race in the Ascot Gold Cup.
"He's come second in a Group Two in France and ran in the Goodwood Cup and come third in that, so he's kept his form well.
"We've given him a little break but we're going there in good form.
"At the start of the season we targeted the Irish St Leger as a race we ought to go for because of the conditions."
Dermot Weld runs Pale Mimosa, who arrives on the back on winning the Lonsdale Cup at York.
Her jockey Pat Smullen said: "She's a quickly improving mare, she's lightly raced and I don't think we've seen the best of her yet.
"Her best run was probably her last start at York so, provided the ground is safe and she's in good form, then I think she goes there with a good chance.
"Leading Light is the one we all have to beat but I think she's an improver."
O'Brien also runs Eye Of The Storm while Godolphin will be double-handed with Saeed bin Suroor's Willing Foe and the Charlie Appleby-trained Encke.
The five-year-old won the 2012 St Leger and he finished a fair second at Goodwood last month on what was his first start in well over a year after being banned for the majority of last season as one of the horses embroiled in the Mahmood Al Zarooni drugs scandal.
Mark Prescott pitches Ebor fourth Pallasator in at the deep end with Achtung, Certerach and Shu Lewis completing an 11-strong line-up.
