UNTIL the Melvista Stakes (2200m) at Ascot on April 2 even his trainer Alan Mathews of Muchea questioned whether Who Dat Singa had the ability to stay.
But after finishing second behind Heart Starter in the JC Roberts Stakes (1800m) on March 19 and the Lex Piper Stakes ( 1600m) on March 5, in the words of Perth racing race caller Darren McAullay Who Dat Singa ran a mighty Derby trial.
In the Melvista Stakes Who Dat Singa was the first to jump.
Big Red Costa then led in the early stages of the race and at 1500m was three lengths in front of Who Dat Singa.
With 1250m to go the race briefly slowed but Big Red Costa still was out in front.
About 1000m Lolong took off on the outside of the favourite Heart Starter to take the lead with about 850m to go.
Jockey Patrick Carbery and Who Dat Singa started to make a move but on the rail Big Red Cosata fought back.
From about 400m Who Dat Singa raced away towards the finish line.
Kia Ora Koutou was second in a late dash to the finish line.