Watts claimed 22 touches playing predominantly in the midfield, while Robertson booted three goals and had eight scoring shots as Casey recorded a 36-point win.
Both players are likely to come under consideration for Melbourne's Queen's Birthday clash against Collingwood at the MCG after the Demons failed to kick a goal after half-time against St Kilda during Saturday night's loss on the Gold Coast.
Casey coach Peter German said Watts is getting closer to his AFL debut.
"It's up to Dean Bailey and the match committee, but each week he is improving," German told melbournefc.com.au.
"Jack had 22 touches and was steady again. He used the ball well and he played mainly up the ground. He was No.1 with our inside 50 kicks for the game.
"It was a reasonable game and he's starting to show some good consistent form."
German said Robertson played well, but could have played much better.
"His whole game was good, but he could've been very good, because he kicked 3.5 and took 12 marks," German said.
"He chased and tackled and did all of the things we asked him to do – he was very good at that. But he could've kicked seven or eight goals. That was the only area of his game that let him down."
