Dwayne Dunn has picked up the Golden Slipper ride on Teaspoon with an ear infection keeping her original jockey in Hong Kong.

Zac Purton had to forfeit rides at Happy Valley on Wednesday night, missing out on three winners.

The problem prevents him from flying to Sydney with Dunn the replacement on the Michael Freedman-trained filly.

"It's pretty exciting [to pick up the ride]. She's a nice horse in the race," Dunn said. Teaspoon is at $35 in early markets while her stablemate Frolic is a $12 chance.

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Meanwhile, Black Heart Bart has been scratched from the Blamey Stakes at Flemington after apparently becoming cast in his box and taking skin off a leg.