Champion jockey Mark Zahra insists Observer only needs to get the plan half-right in order to justify his billing as the short-priced favourite in the $2 million Victoria Derby (2500m) at Flemington.
Zahra enters the famed Melbourne Cup carnival full of confidence and with a strong book of rides, including Joseph O'Brien-trained Cup fancy Al Riffa and Ciaron Maher's star colt Observer in Saturday's Derby.
