Former Otaki trainer Rachael Frost enjoyed a breakthrough victory at Sandown on Wednesday when Redefine was successful in the Spicer Thoroughbreds Handicap (1400m).

Newly arrived New Zealand trainer Rachael Frost is hoping to make a quick impact on Melbourne racing at Caulfield on Saturday.

Progressive three-year-old Redefine completed a winning treble when he dominated his rivals from the front over 1600 metres at Hastings on the weekend.