Stacy Lewis enjoyed seven consecutive birdies in tying the Evian Masters record with a 9-under 63 in the opening round on Thursday.
Her birdie flurry from holes 5-11, plus two more on 17 and 18, helped Lewis to a two-shot lead over early front-runner Hee Young Park of South Korea.
Lewis matched three-time champion Helen Alfredsson's round of 63, set by the Swede in 2008.
Park, who used a belly putter for the first time in her career, was also in clinical form and sank five straight birdies on the front nine.
South Korea's Ilhee Lee is three shots behind Lewis in third place.