The visitors, who had waited for eight long years to make the showdown, overcame the giants by 27 runs at Victoria Park on Saturday.
In the women’s match at Turangi Oval, defending champions Muri retained their title after a close win against Avana/Turangi.
Muri hit 162 runs to set an exciting chase which Avana/Turangi missed by just five runs after managing 158.
Daena Kataina was the toast for the Muri side after scoring half a century but June George stole the show after smashing 69 runs.
In the exhilarating men’s tussle played under windy conditions, Tupapa was unable to produce any extraordinary performances with the bat but its middle and lower end batsmen, who are mostly youngsters, steered the team to a competitive 94 runs.
After losing five quick wickets for just 30 runs, Turangi looked in trouble before Mapu Maoate, Teinaki and David made some decent runs to boost their total count.
Turangi was all out for 94 in 17.2 overs.
Jr Kolua was impressive in bowling for Tupapa after collecting four wickets in the four overs he bowled, conceding 20 runs.
The home side started its inning on a high before Kanute Ritaua was caught in a LBW after scoring 13 runs.
Among some controversy, wickets started falling with five Tupapa batsmen including a golden duck heading for an early shower without scoring a run. Osolai was the top scorer for Tupapa after managing 23 runs.
Tiri and Vane Junior Tangimetua were impressive in bowling for Turangi after picking four wickets each.
Youngster Vane Jr conceded just a run and two maidens in the three overs he bowled.
Turangi skipper Vane Tangimetua Sr was pleased with his team’s effort and hailed the players for putting up a great fight against the former champions.
Tupapa captain Patiimai Ataela was graceful in defeat and hailed the visitors a better side on the day.
Cook Islands Cricket chief executive officer Alister Stevic said the 2015 season was one of the best he had seen in recent years.
“I think this is easily the best season I have seen in six years. The standard compared to two years ago in field, pitches and the play has been extraordinary,” Stevic said.
“I think the umpires have played a huge part increasing the standards and I thank each and every one for their support and effort.”