To put the upset in context, Canterbury came into the contest with a perfect record, having won by an average of 36 points per game and running in 27 tries in their four clashes.
The last two games between the provinces ended with a 50 point and 65 point trouncing in favour of Canterbury, while Manawatu had struggled through their early slate of mediocre opposition in 2016.
The dour conditions would have played into Manawatu's favour, with no tries being scored in the first half for the first time in this season's Mitre 10 Cup.
Manawatu were the better team in the first stanza, and kept Canterbury from crossing the line until the 60th minute, when impressive winger George Bridge managed to cross in the corner to give Canterbury the lead.
But just as it looked like Canterbury's unbeaten run would continue, the hosts pulled out a Manawatu miracle.
Manawatu 19 (Jackson Hemopo try; Otere Black con, 4 pen)
Canterbury 13 (George Bridge try; Richie Mo'unga con, 2 pen)
Halftime: 9-6