England women moved within one victory of regaining the Ashes after opening up an 8-4 lead over Australia with a 15-run victory in the opening Twenty20 encounter at Chelmsford.
Inspired by Sarah Taylor's career-best 77, England racked up 146-4 batting first and, after losing three early wickets, Australia never threatened as they posted 131-5 in reply.
Australia now need to win the remaining two Twenty20s to prevent Charlotte Edwards' side taking back the Ashes.
Fresh from her half-century against the Southern Stars two days earlier, Taylor came to the middle in the second over after captain Edwards fell for a quickfire 17.
Taylor struck six boundaries and shared a lively 88-run partnership with the recalled Dani Wyatt, who chipped in with a useful 28.
The 146-4 total looked around par at the compact Essex venue, however three wickets inside the first seven overs of the Australia reply swung the game hugely in England's favour.
Arran Brindle swooped at midwicket and threw down the stumps to remove Meg Lanning for two and opening partner Alyssa Healy departed four balls later when she edged Katherine Brunt behind to Taylor.
England's leading wicket-taker in Twenty20 cricket, Jenny Gunn, then got in on the act by clean bowling Australia captain Jodie Fields, and the game was as good as up for the visitors when Jess Cameron (35) presented Gunn (2-33) with a return catch.
Ellyse Perry (30no) and Rachael Haynes (25no) added some respectability to the Australia total, but they never threatened victory, something they must achieve at the Ageas Bowl on Thursday to keep the series alive.