Thailand's Pornanong Phatlum ended the second day of play at the Womem’s British Open at Royal Lytham and St Annes as surprise halfway leader on a day made notable by a hole-in-one from Canada’s 20-year-old Brooke Henderson.
Phatlum, who has only made the cut on one of her previous seven appearances, matched her opening 67 with another five-under round to finish at ten under par in this Ladies Professional Golf Association championship at an event which is the fourth of this year's five women's majors.
Britain’s 22-year-old Georgia Hall is one of three players a shot behind.
Hall has not made a single bogey in her opening two rounds, carding a four-under 68 on Friday to go nine under.
She is bidding to become only the third British winner since the event became a major championship in 2001.
Australia's Minjee Lee and Mamiko Higa of Japan are also on nine under.
Thailand's world number one Ariya Jutanugarn shot a two-under 70, moving her to three under par alongside Scottish veteran Catriona Matthew, England's Florentyna Parker, Wales' Lydia Hall and defending champion Kim In-kyung of South Korea.
Henderson’s flourish at the par-three ninth hole was the second ace of the week following the opening round effort by Britain's Florentyna Parker’s, and helped her to a position of equal eighth at five-under.