Two-year-old Bella Rosa defied rain and poor visibility to win the opening race on Melbourne Cup day for in-form trainers Ciaron Maher and David Eustace.
Under hard riding from Mark Zahra, the horse - by champion sire Snitzel - showed his class in wet conditions when he held out Lankan Star and the favourite Champagne Boom.
Jockeys returning to scale said visibility was poor and surface water on the track was creating some concerns with the track downgraded to a Heavy 8 soon after the race.
Zahra told Channel Seven the horse raced like a professional at his first start.
Melbourne Cup-winning jockey Damien Oliver rode Champagne Boom into third place and was optimistic the conditions would settle.
"They're pretty horrendous conditions but I think once the water has the chance to work its way into the track it won't be too bad, but at present there is a lot of surface water," Oliver said.