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[1] Cowper made his state debut against the touring Marylebone Cricket Club side of 1965–66, called up after an injury to Ray Jordon.
[2] Batting at number nine, he made 60 not out in Victoria's first innings and shared in a unbeaten 122 run partnership with Graeme Watson for the eighth wicket.
[2] Cowper featured in Victoria's next match against Western Australia, he scored 3 and 22 not out in his only experience of Sheffield Shield cricket.