Coming back into Premier 50-over cricket, Collegiate struggled in the chase and were three wickets down before getting a run on the board.
Scaracens' Bryant Galpin (5-18) tore through the schoolboys, who managed 76 before being dismissed in 20 overs.
Beau Hourigan (25) and Nate Lewis (17) were the only Collegiate batsmen to score double figures.
At Tasman Tanning Victoria Park, an innings of 91 at more than a run a ball from Ross Kinnerley was the only resistance Tech put up in their pursuit of Paraparaumu's 232.
The defending champion Paraparaumu batted out their 50 overs and were able to create mini-partnerships for each wicket.
Fraser Kinnerley picked up 3-38 of his 10 overs, but Tech were unable to find the back-to-back wickets they probably needed to give themselves a chance.
In response Ross Kinnerley's innings was a shining light and the only batsmen to score double figures - as he hit 10 fours and two sixes on his way to 91 off 85.
Tech were 67-2 at one point in the chase but from there lost regular wickets to be all out for 160 in the 40th over.
Meanwhile, Marist's trip to Weka Park in Raumati Beach was short-lived as they were demolished by Kapiti Old Boys by eight wickets in 13 overs.
The visiting side could only manage 105 despite a half-century from Mark Fraser.
Marist were going strong at 78-3 approaching the 20th over, before a collapse ended their innings just 12 overs later with the only 27 more runs on the board.
Kapiti bowler Carter Andrews (4-24) proved a handful for Marist.
In Levin, Weraroa cruised in their chase of Levin Old Boys' 215 all out, clinching a five-wicket in with fours overs to spare thanks to openers Matthew Good (97) and Adam Simonsen (72) - who put on a 151-run opening stand.
Last season's beaten finalists Property Brokers United still wait to get their season underway, having sat out Saturday with a bye.
Next Saturday, Collegiate host Tech in the only match to be played in Whanganui.
Marist travel south to take on Weraroa, as do United who are away to Kapiti Old Boys, while Saracens have the bye.
Scoreboard
Marton Saracens Premiers 133 (S Oliver 39, B Galpin 5-18) bt Wanganui Collegiate 76 (B Hourigan 25, B Kelt 3-15) by 58 runs.
Paraparaumu 232-9 (R Subasinghe 65, C Emmott 34no, B McGown 3-17) bt St Johns Tech 160 (R Kinnerley 91, F Kinnerley 3-48) by 72 runs.
Marist 105 (M Fraser 50, C Andrews 4-24) lost to Kapiti Old Boys 109-2 (R Hickey 41no, T Redpath 1-22) by eight wickets.
Levin Old Boys 215 (J Pinfold 60, B Te Tomo 49, D Kennett 3-31) lost to Weraroa 217-5 (M Good 97, A Simonsen 72, T Kauwhata 4-37) by five wickets.
Property Brokers United bye.