Michael Clarke's men were already through to the quarter-finals but there was no easing up from left-arm fast bowler Starc at Bellerive Oval.
The 25-year-old took four for 14 in just 4.4 overs as Scotland were shot out for 130 after Clarke won the toss.
That left Starc topping the tournament bowling charts with 16 wickets in five matches at a stunningly low average of 8.50 apiece.
"Yeah, the ball is coming out nicely, I can't complain at all. Well, it's coming out consistently, but more importantly we're winning games and that's all that matters," the New South Wales paceman added.
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Starc's brilliant six for 28 almost rescued an improbable win for Australia over fellow co-hosts New Zealand at Auckland's Eden Park in a match they eventually lost by just one wicket.
But since then it's been a largely smooth ride into the quarter-finals for Clarke's men, bidding to win Australia's fifth World Cup title and first on home soil.
"I think we're all bowling quite well, we're training well, so yeah, personally it's just nice to see the ball coming out consistently. We're working on different plans, whether it be in training or in the game, but it's nice to see them coming off.