Oliver Fisher has carded the first sub-60 round in European Tour history.
The Mooloos gave neighbours Bay of Plenty a Mitre 10 Cup hiding.
The flanker has made himself unavailable for the remainder of the Rugby Championship.
The Kiwi boxing heavyweight was Joshua's last victim in April.
The number eight will remain in New Zealand and rejoin his team in South Africa.
The Auckland club won just one game in the inaugural women's competition.