Trailing 21-0 inside the opening 20 minutes, Whanganui refused to go away, clawing their way back into the contest before producing two late tries to complete an extraordinary turnaround and deny the home side the trophy in the dying moments.
South Canterbury looked in complete control early on, with Patelesio Oneone opening the scoring inside the first five minutes. His converted try was followed by an intercept from Ben Hanrahan, putting the hosts on the front foot and setting up a slick attacking move that ended with veteran Willie Wright crossing for the first of his two tries.
Wright struck again just five minutes later, darting through the defence to score under the posts and convert his own try as South Canterbury raced to a 21-0 lead.
But Whanganui began to find their footing, with Shay Smith-Luond finishing a pop pass from Tevita Asi to get the visitors on the board. Oneone responded with a rare drop goal to extend South Canterbury’s advantage, but the momentum was beginning to shift.
Whanganui finished the half strongly, with hooker Jack Yarrell powering over from a rolling maul before Asi landed an impressive 50:22 to give his side another attacking opportunity. Jonty Bird made the most of it, crashing over to bring Whanganui within seven points at the break, trailing 24-17.
The second half delivered more of the same end-to-end action. South Canterbury struck first, launching a sweeping 100-metre attack finished by Fynlay Hobson under the posts, only for Whanganui to respond through Yarrell’s second try of the afternoon.
Wright added a penalty to stretch the lead, but Whanganui’s attacking threat was never far away. Competition try-scoring standout Alekisio Vakarorogo produced a moment of individual brilliance, collecting the ball inside his own 22 and weaving his way through the South Canterbury defence to score a spectacular try.
South Canterbury again found an answer, with reserve prop Anuanu Ohai barging over from close range before Taine Cordell-Hull added a penalty to put the hosts ahead 42-31 with less than five minutes remaining.
With the Lochore Cup seemingly within reach for South Canterbury, Whanganui launched one final assault.
Finding space out wide, Ofa Tauatevalu linked with Juan Tantrum, who was brought down just short of the line. Quick hands at the breakdown sent the ball to Ekenasio Fiso, who dived over in the corner to cut the deficit to five points.
The clock had expired, but Whanganui were not finished.
They continued to hammer away at the South Canterbury line, keeping the ball alive through phase after phase as the home side desperately tried to hold on. Eventually, the ball found its way to Asi, who crossed to complete the comeback before calmly adding the conversion to seal a remarkable 45-42 victory.
From 21 points down to Lochore Cup champions, Whanganui produced a finish worthy of a final, leaving Timaru with the silverware after one of the most dramatic matches of the Heartland Championship season.