Gillette Cup joint holders Tauranga Boys' College and Christchurch Boys' High School opened their bids for an outright win with victories on the opening day of the tournament at Palmerston North.
Kane Williamson made an unbeaten 120 not out, the fourth-highest score in finals history, as Tauranga chased down Otago BHS’ 219 for six. Hamish Rutherford top scored for Otago with 98.
In the other Pool A game, Tim Southee took six wickers for just 31 runs to help King's School complete a six-wicket win over Rathkeale College.
Brock Price put Rathkeale in a strong position with 53, but New Zealand Under-19 bowler Southee instigated a collapse.
A second-wicket stand of 77 between Angus McLean and Kai Petersen set the foundation for an easy win in the 33rd over.
Corey Anderson struck an unbeaten 103 as Christchurch BHS defeated Hamilton Boys’ High School by 79 runs in Pool B.
Anderson put on a record unbroken stand on 117 with Tyler Bleyendaal (55no), to put on 295/4.
Brad Perrett’s half-century was not enough for Hamilton, who ended on 216.
The day’s other game saw hometown school Palmerston North Boys' High School defeat St Patrick's College (Silverstream) by three wickets.
Chad Law struck 94 not out to help PNBHS to victory from a vulnerable 32 for six to chase down St Patrick’s 171 for six.
Otago BHS 219/6 [Hamish Rutherford 98, Cameron Rutherford 44, Ben Main 27, Colin Aitken 21; Duncan Flavell 2/44]
Tauranga BC 223/3 [Kane Williamson 120*, Dane Sorrenson 54; Sumukh Paranjipe 2/45]
Result: Win to Tauranga BC by 7 wickets
Rathkeale: 130 [Brock Price 53, Andy Dodd 21; [Tim Southee 6/31, Andrew de Border 3/12]
Kings: 132/4 [Kai Petersen 52, Angus McLeod 40; Doug Bracewell 2/24]
Result: Win to King's College by 6 wickets
Christchurch BHS: 295/4 [Corey Anderson 103*, Tyler Bleyendaal 55*, Sam Noster 37, Brendon McFarlane 28, Cameron Hall 24; [Daniel Thomas 2/35]
Hamilton BHS: 216/4 [Brad Perrett 51*,Ben McPhee 35*, Carl Botha 29, Steve Martin 23, Izac McKillop 23; [Matthew Smith 2/53]
Result: Win to Christchurch BHS by 79 runs
St Patrick's College: 171/6 [Jonathan Evans 41, David Houghton 38, Sam Outtrim 26, Chris Gorrie 20; George Worker 2/30]
Palmerston BHS: 173/7 [Chad Law 94*, James Cleland 25*; Aaron Pennell 2/27]
Result: Win to Palmerston North BHS by 3 wickets