River Delta made trainer Peter Moody sound like a prophet with her strong Flemington win.

Moody declared River Delta would win the Prudential Plate, telling Melbourne radio on Friday the three-year-old had the ability to be a top class filly.

River Delta won a Yarra Valley maiden at her only previous start and lived up to Moody's assessment of her at Flemington.

Her natural pace allowed jockey Linda Meech to take a prominent position on the $2.70 favourite before she dashed clear to beat Best Yet To Come ($26) by 1-1/4 lengths.

Best Yet To Come also ran second to River Delta at Yarra Valley.

Meech said Moody told her to handle River Delta gently in the early stages of the $80,000 contest to prevent her from over-racing.

"We went out with a plan to go forward but take our time getting there," Meech said.

"It worked out really well because she didn't get fired up."

Meech said River Delta's tendency to drift in under pressure showed the filly had plenty to learn.

Moody's representative Zach I'Anson said the Caulfield trainer could send River Delta to Sydney for a race during the latter part of the autumn carnival.

Apprentice Patrick Moloney's day ended when he fell from Sweet Starlett at the 800 metres.

Moloney was taken to hospital for X-rays to determine whether he had broken his ankle.

Moloney was attempting to find cover for Sweet Starlett behind Soosa Rama when his mount faltered.

Stewards have opened an inquiry into the incident.

The Leon Corstens-trained Leia ($18) finished well for third, while the previously unbeaten Soosa Rama beat one runner home after settling back in the field, disappointing those that backed her from $4.20 into $3.90 on track.