Rachel Teske was the first to post the lead with six birdies and a solitary bogey. Joining her soon afterwards was 24-year-old Melissa Bransdon, who almost set the course afire, posting six consecutive birdies from the fourth hole.
'I'm very happy with the way I played today, I missed a few putts on the front nine, but made a few nice ones on coming home - It was a good start,' said Teske.
And in one of the last groups of the day, rookie Tamara Hyett, who finished seventh at the Evian Tour Qualifying school in October, closed with her sixth birdie of the day at the final hole to join her compatriots.
'I've been practising a lot from 80 metres and in recently and that paid off today,' said Hyett, who possesses a rhythmical and powerful swing.
'I've been peppering the pin all day, which is always nice. It must have been that good dinner and a couple of glasses of red wine last night!'
But with perfect conditions on the course, the pack is close behind. Scotland's Julie Forbes posted a 4-under-par 69 to sit alongside England's Georgina Simpson and another Australian, Loraine Lambert. Marine Monnet from France fills the gap on 3-under.
Laura Davies put behind a triple bogey eight at the 12th to post a gutsy 71 for 2-under, keeping her in contention for her 65th worldwide title.
Joining Davies was Solheim Cup partners Trish Johnson and Swedes Sophie Gustafson and Maria Hjorth, Paula Marti from Spain and Australian's Corinne Dibnah, along with Carlie Butler.