Tony Goodin and Andrew Gibbs bowled with genuine pace and enthusiasm to take two wickets apiece, but the hosts held their nerve to reach the target in the 47th over with three wickets to spare.
BOP Development had more success against Northern Districts Under-19s at Bay Oval.
Two youngsters ripped the Under-19 side out for just 142, with Brody Gilroy taking 4/13 and Shannon McSkimming taking 3/30 on debut.
The Bay struggled for the majority of the chase, eventually getting home with two wickets to spare.
Stephen Crossan, batting at six, took his side to victory with an unbeaten 36, while Alex Gooding posted 22.
The Bay team management praised the performance of 16-year-old Alastair Blackett, who grabbed a wicket with the ball before grinding out a valuable 13 runs with the bat.