SHIMA SHI, Japan - Jiyai Shin fired a six-under 66 Saturday to grab a two-stroke lead after two rounds of the Mizuno Classic.
Shin, the world No. 1, completed 36 holes at 13-under-par 131, She will go for her second win of the season on Sunday. Earlier in the year, Shin claimed her seventh LPGA Tour title at the Evian Masters.
"I feel really good because I won this event two years ago," said Shin, who missed just two greens in regulation on Saturday. "So I have a good feeling."
Stacy Lewis fired a bogey-free, eight-under 64 to move into second place at minus-11. Yani Tseng, a two-time major champion this year, posted a 65 to climb into a share of third with Miki Saiki (67) at 10-under-par 134.
Morgan Pressel (69) is alone in fifth at minus-nine, while Meena Lee (69) is one stroke further back.
Yukari Baba, who shared the first-round lead with Shin, managed an even-par 72 at Kintetsu Kashikojima Country Club. She slid into a tie for seventh place at seven-under-par 137.
Shin, the 2008 champion, broke free from an early logjam atop the leaderboard with a birdie on the fourth. After Baba joined her in the lead, Shin birdied the seventh for the second straight day to move one ahead.
Around the turn, Shin birdied the 10th to keep a one-shot advantage over Baba and Pressel. For the second day in a row, Shin birdied the par-five 13th to keep her one-shot lead.
Lewis birdied the last to join Shin at minus-11, but Shin responded with a birdie on the par-five 16th. Shin pushed her lead to two strokes after a birdie at the last.
"I didn't make any bogeys and made six birdies. My shots were really good," Shin admitted. "Usually when I play as the leader, I try to not make mistakes, but I think tomorrow I have to be aggressive."
The 25-year-old Lewis did her scoring in bunches Saturday. After a birdie on the first, she converted back-to-back birdie efforts from the third. Lewis carded her fourth birdie of the day on the par-four sixth to gain a piece of the lead.
Lewis ran off six consecutive pars around the turn. She drained a birdie effort on the 13th and made it two in a row with a birdie No. 14.
At the 16th, Lewis made birdie for the second straight day to get to 10-under. For the third time in her round, Lewis grabbed a share of the lead with a birdie at the last. Shin later moved ahead, but Lewis is still within range of gaining her first official LPGA Tour victory.
"I played really well today. The front nine could have been seven- or eight- under pretty easily, but I am not going to complain," Lewis said. "I played really good and hit some solid putts coming in."
Baba was joined in seventh place by Na Yeon Choi (70), Chie Arimura (70), Young Kim (69), Jimin Kang (69), Mika Miyazato (69) and 2007 winner Momoko Ueda (67). Choi, the LPGA Tour's leading money winner, claimed her second win of the season last week.
NOTES: Lewis won the 2007 NW Arkansas Championship as an amateur, but the victory was unofficial because the event was shortened to 18 holes by rain...Defending champion Bo Bae Song carded her second straight one-under 71 and is tied for 37th at minus-two...Former world No. 1 Ai Miyazato struggled to a seven-over 79 to slide into 77th place in the 78-player field at plus- seven