Sorenstam shot a 70 to finish five strokes back at 9-under 207 on the Kashikojima Country Club course. The Swedish star also failed in her second attempt in a month to win an LPGA Tour event a record six times.
Sorenstam began her streak in 2001 at Musashigaoka and won the next four years at Seta. Last year, she became the first LPGA Tour player to win a tournament five straight times and matched the record she shares with Mickey Wright for victories in an event. Sorenstam also had a chance to win the Samsung Championship for the sixth time last month, but lost a final-round lead to Lorena Ochoa.
Webb won for the fifth time this season to match Ochoa for the LPGA Tour lead and push her career total to 35. The resurgent Australian star earned $180,000 to move into second place behind Ochoa on the money list with $2,069,613.
Webb, a stroke behind leader Momoko Ueda after the second round, opened with a birdie on the par-5 first and parred the next eight holes to make the turn at 9 under. She pulled away with birdies on Nos. 10-12, 14 and 16.
The Hall of Famer opened with rounds of 69 and 67 and had only one bogey in the tournament -- on the 16th hole in the first round.
Higo, one of 35 Japan LPGA players in the 76-player field, shot a 65.
Brittany Lang (70), Aree Song (70) and Jeong Eun Lee (70) tied for third with Sorenstam at 9 under, and Japanese stars Ai Miyazato (71) and Shinobu Moromizato (70) finished at 8 under. Ueda followed her second-round 64 with a 74 to tie for ninth at 7 under.
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