Sydney's premier apprentice Kathy O'Hara will get her first taste of Group One racing when she is legged aboard Johan's Toy in Saturday's Epsom Handicap at Randwick.

Trainer Guy Walter has entrusted O'Hara with the ride on the mare who has just 50.5kg in the Epsom Hcp (1600m).

"Kathy will ride Johan's Toy who I think is a great lightweight chance," Walter said.

Johan's Toy finished a length third to stablemates Shalimar Sky and Fantasia in the Tibbie Stakes (1400m) at Newcastle on September 14 where Walter created history by training the first four with Hennessy Waltz completing the quartet.

On that occasion, Johan's Toy was ridden by Glen Boss who is committed to Cameron Handicap winner Collate in the Epsom.

Walter believes Johan's Toy, who started favourite in the Listed race, was unlucky after being stuck wide from the outside alley.

In the autumn she finished third in the Group One Coolmore Classic to another stablemate, Danni Martine, who will be ridden by Michael Cahill in the Epsom.

O'Hara said she was thrilled to get the chance to ride in the Epsom and she is also in the mix to ride Melbourne stayer Above Deck if he starts in the Metropolitan Hcp (2400m).

"It will be good to ride in a Group One," O'Hara said.

"It's the best race there is so even just having a ride in one will be great.

"Johan's Toy is probably a lightweight chance if she draws well and gets a nice run."

O'Hara has also been invited to ride at Caulfield in Melbourne on Thousand Guineas day, October 12, and has a trip to Dubai to look forward to in November.

"The club has invited a few female jockeys - me, Claire Lindop, Michelle Payne and Lisa Cropp," O'Hara said.

"I'm looking forward to riding in Melbourne, getting the chance to race the opposite way will be good experience."

O'Hara moved from Dubbo to the NSW south coast stable of Gwenda Markwell earlier this year and was an instant success with Walter one of her biggest supporters.