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Defending champion Suzann Pettersen was 2-under after a 71. Last year, the Norwegian star Pettersen overcame a nine-stroke deficit in the final round and won in a playoff.

It was nearly 30 degrees cooler Saturday following Friday’s scorching 100-degree day. Players said lower temperatures made the 6,611-yard course play longer.

Miyazato birdied two of her final four holes in her bogey-free round to take the lead.

“I had so much good today,” Miyazato said. “My second shot was very well. But I had so much frustration on the putting on the front nine.”

The Miyazato name is familiar on the LPGA Tour, though not Mika, but Ai Miyazato, winner of the 2010 Safeway Classic. Ai Miyazato, four years older than Mika, has nine career LPGA Tour victories.

The Miyazatos aren’t related.

“Everybody asks me, “Oh, are you Ai’s sister?’” Mika Miyazato said. “It’s OK. I think everybody knows Ai, so I don’t know if somebody knows me. I think it’s lucky. Same last name, just different first name.”

Ryu, the LPGA rookie points leader, briefly took the lead after shooting a 5-under 30 on the back nine _ her first nine.

Kerr had birdies the three-hole stretch of par 5s from No. 8-10 to edge into contention.

“It gives me some good momentum going into tomorrow,” Kerr said.

Michaels, an LPGA Tour rookie from UCLA, made an eagle at the par-5 ninth to pull within one stroke of the lead. She struggled late, hitting her tee shots into the water at 17 and 18.