(CNN) -- Yani Tseng remains four strokes clear of her rivals after a third successive four-under-par 68 in the women's British Open at Royal Birkdale.
The 21-year-old -- who has only made one bogey in her 54 holes so far -- led by four shots after Friday's second round and maintained that advantage thanks to a superb eagle on the 18th.
The Taiwanese is on 12-under-par for the tournament, clear of Australia's Katherine Hull (66), with Korean Kim In-Kyung another two strokes further back in third position after also carding a 66.
Tseng parred the first 12 holes on Saturday before birdies on 13 and 15, prior to holing a 20-foot eagle putt for a three on the par-five final hole.
Despite her lead, Tseng is taking nothing for granted, telling the official LPGA website: "I think it's going to be fought on the last four holes on Sunday.
"The three par-fives will be significant. I think if the wind changes, everybody can reach the last two holes."
Tseng is attempting to secure her third major victory following her wins in the 2008 LPGA Championship and this year's Kraft Nabisco Championship. She also won the Australian Open in February.
Brittany Lincicome is the leading American after finishing with back-to-back birdies for her 71 and she lies alone in fourth position, seven shots off the pace.
France's Anne-Lise Caudal, who was joint second at the halfway stage, slumped to a three-over-par 75 and is out of contention on one-over par 216 -- the same score as Michelle Wie, who carded a one-under 71.
World No.1 Shin Jiyai carded a level-par 72 and is 10 shots behind, but the Korean would have been much closer to Tseng is she had not posted a quadruple bogey eight on the par-four 11th hole.