Leading Sydney trainer Chris Waller claimed stakes victories in two states on Thursday, culminating in Tromso's Ladies Day Cup win at Hawkesbury.

Waller-trained horses won three of the first four VRC Oaks day races at Flemington before Tromso gained a photo decision over Ninth Legion in the Listed race at the western Sydney racetrack.

Tromso, backing up after a narrow defeat at Rosehill last Saturday, held on for jockey Josh Parr to score by a nose from Ninth Legion.

The Peter Snowden-trained Soledad finished third.

It is the second Hawkesbury feature for Waller this season after Coup Ay Tee won the Hawkesbury Gold Cup in August.

Tromso made the running with Ninth Legion parked at his girth and the pair settled down to a stirring duel.

Ninth Legion appeared set for victory but Tromso was awarded the judge's decision after getting the final stride in at the precise time.

Waller's Flemington winners were Marmelo, Multilateral and Dystopia in the Group Three GH Mumm Stakes (1100m)