No 2 seed Mako Thompson beat Matt McLean 3&2, No 3 Adam Winter pipped Hiroki Miya 1up and so did No 4 Tyson Tawera over Reid Hilton. No 5 Russell Mitchell eclipsed Dominic Brettkelly 2up.
Top seed Ben Swinburne registered the only loss, going down 3&1 to Tom Parker.
The Bay are sitting on 15 match wins, half a game below division two leaders North Harbour and 3.5 games above third-placed Otago.
Undefeated Auckland, flying under the radar most of the week, humbled hosts Northland for a captivating 3-2 victory.
Waikato also boast an unblemished record. However, today they lock horns with Auckland and Wellington to determine who will shape up as the semifinalists.
Wellington and Otago had a slight hiccup, recording halves against Manawatu/Wanganui and Poverty Bay/East Coast, respectively.