Bann hit the summit after piling more misery on struggling Quins
The Division 2A Ulster derby at Deramore turned out as expected with Banbridge going top of the table after emerging 27-0 winners over relegation certainties Belfast Harlequins.
The five-try bonus-point win was just what Bann required though their one-point lead over Highfield has to be put in context as the Cork side's game fell to the weather.
In fact, Bann were the only side in 2A's top five to get a game at the weekend with Queen's University and Malone also having their away games called off.
At a soggy Deramore, it took Bann half an hour to get their first score when full-back Adam Ervine crossed for an unconverted try.
Their second - from lock Colin Bickerstaff - followed shortly afterwards and Bann only led 10-0 when it came to the break.
The bonus point was secured with Ervine's second, which followed winger Simon Lloyd's effort, and Ryan Hughes rounded it all off.
In 2B, Armagh's 36-10 win at home over Skerries kept them top but neither Dungannon or relegation-battling City of Derry had such good fortune with Gannon losing 39-5 at Greystones and Derry 20-11 at Wanderers.
In 2C, third-placed Rainey's hopes of finishing top took quite a hit as they lost 17-13 at home to Sligo while Bangor's game at Midleton was off.
Div 2A: Belfast Harlequins 0 Banbridge 27, Blackrock 14 Cashel 23, Corinthians v Queen's off, Nenagh v Malone off
Div 2B: Armagh 36 Skerries 10, Bective 0 Old Crescent 17, Greystones 39 Dungannon 5, Thomond 22 Barnhall 28, Wanderers 20 City of Derry 11
Div 2C: Boyne v Seapoint off, Bruff 8 Navan 15, Kanturk v Tullamore off, Midleton v Bangor off, Rainey 13 Sligo 17