Norma Brain, of East Oxford Conservative Club, could not prevent an 8-1 walloping against Blackbird Bar in the Premier Section of the Morrells ODDA.
The Blackbird are quickly establishing themselves as one of the best ladies' sides in the county.
Entertaining East Oxford, they raced into a 5-0 lead.
The visitors pulled one game back through Brain, but the home side raced to a 3-0 pairs win for a stunning 8-1 success.
The battle for Section 5 honours looks set to go to the final game.
Gladiators Social Club take over the top spot for the first time after a 6-3 win over Cowley Workers Club after two victories from Moir.
The Head of the River notched up their tenth win in eleven games as they took a firm hold at the top of Men's Section 6.
The leaders raced into a 6-0 lead against Cricketers Arms B with wins from Shorter, Oram, McNish, Clive Shorter, Skelcher and Brooks and, despite at 2-1 pairs loss, they recorded a fine 7-2 success
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