Impressive Newbury maiden winner Vow tests the water in Listed company in the Betfred "The Bonus King" Oaks Trial Stakes at Lingfield on Saturday.
The William Haggas-trained filly is a daughter of Derby hero Motivator and a half-sister to smart stablemates Harris Tweed and Beaten Up, having been bred by Haggas' father, Brian.
She could hardly have been more impressive on her racecourse debut and aims to keep her Epsom Oaks dream alive by landing this recognised trial, which will this year be run on the all-weather as the turf course is unraceable.
Harry Herbert, racing manager for owners Highclere Thoroughbred Racing, said: "She's in good form and we hope she'll handle the surface all right.
"We wanted to run her on turf, coming down the hill and round the bend as it would be more Epsom-like.
"We haven't quite got what we wanted but, looking at the ground everywhere else, William didn't want to run her on very bad ground and this is our only option.
"It was a very impressive performance at Newbury and we've always liked her a lot. We're hopeful she'll be very competitive.
"She's been a green filly as well so we hope she'll have learnt a lot from her first race.
"William knows the pedigree well and the filly herself looks marvellous.
"I think she'll stay the mile and a half well."
Ed Dunlop's course winner Zimira was rerouted here having been withdrawn from the Cheshire Oaks earlier this week on account of the testing conditions.
The Newmarket trainer said: "She won here, but we're under no illusions it's a very tough ask.
"The form of her maiden hasn't worked out fantastic, but she doesn't know that and she'll take her chance in what looks a very competitive race.
"She's drawn in the middle (stall six), we're on a fact-finding mission, and we'll see whether she's up to it. Time will tell."
Roger Charlton's Estrela impressed on her second juvenile start over a mile at Newbury and the Beckhampton trainer is keen to find out whether her stamina lasts out over a mile and a half.
He said: "She's in good form and she's a filly who likes a fast surface.
"It didn't look like we were going to get that anywhere, so we've opted for the all-weather.
"It's a bit of an unknown - I'd prefer good to firm turf, but there's not much of that around at the moment.
"The other question mark is whether she'll actually stay a mile and a half.
"She finished well over a mile last year, but this is a bit of a step up."
Ralph Beckett would rather be running Colima on turf, but feels he has been left with little option.
He said: "It's slightly unfortunate that the Derby meeting at Epsom is a week earlier this year, as otherwise I'd wait until next week and run at York (Musidora Stakes).
"But then you are getting too close to the Oaks and we'll have to run on Saturday, even though it is a long way from ideal.
"I have no worries about the trip or the surface, I'd just much prefer to be running on turf. But we need to find out whether she's good enough to go to Epsom."John Gosden saddles both Dinvar Diva and Apothecary, with stable jockey William Buick riding the former.
She finished fourth in a Leicester maiden in September, her only start to date, while last month's Wolverhampton winner Apothecary was rerouted here from the Cheshire Oaks.
"Dinvar Diva has been ready to run for a while but due to the ground we haven't been able to get her out, so we're starting her off here on the all-weather," said Gosden.
"It's probably not ideal to be starting off in a race like this but we need to get her on the track.
"Apothecary has won her races and she actually went up to Chester for the Cheshire Oaks, but we took her out and she then came all the way home again.
"We need to get her out again and if either of them finish in the first three, I'll be delighted."
Richard Hannon saddles Varnish and told his website www.richardhannonracing.tv: "She was a bit unlucky not to win her maiden at Newbury on her second start last year, and she has done well through the winter, though she, too, tries the sand for the first time."