La Jolla, CA (My Sportsbook) - Jiyai Shin shot a three-under 69 to take sole possession of the lead Friday after two rounds of the Samsung World Championship.

Shin, who captured her third win of the season last week in Arkansas, remained atop the elite 20-payer field after sharing the first-round lead with Song-Hee Kim on Thursday.

The 21-year-old Korean -- ranked No. 2 in the world behind Lorena Ochoa -- collected six birdies and three bogeys and finished two trips around Torrey Pines at nine-under 135.

Ochoa, a two-time Samsung champion, eagled the 18th hole to shoot 69 and pull to within a stroke of Shin's lead at eight-under 136. Ochoa has won twice this season but not since the Corona Championship in April.

Japanese star Ai Miyazato (68) is tied with Ochoa for second place but only after making bogey at the 18th hole to fall out of a share for the lead with Shin.

Sophie Gustafson (70) stands alone in fourth place at seven-under 137, while defending champion Paula Creamer (69) leads a four-way tie at six-under 138 that also includes Cristie Kerr (66).

By her own admission, Shin played it safe on the front nine; however, she still ran into trouble.

After holing a 33-foot putt for birdie on No. 2, Shin made her first bogey of the round when she two-putted from six feet at the fourth hole. Back-to-back birdies at the fifth and sixth were followed by an errant hybrid shot into a bunker at the eighth and another bogey. She rebounded with a short birdie at No. 9 to make the turn at eight-under par.

"Today my play was a little bit up and down," said Shin.

She reached as low as 10-under par after back-to-back birdies at the 12th and 13th holes. But Shin made a bogey at the 14th, where she into another bunker and then two-putted from just five feet.

Her lead was saved by two scrambling pars -- at the 17th, where she hit a thin six-iron into a bunker; and at the 18th, where she coaxed a closing par out of a badly-sliced drive.

"I think No. 17 and 18 were great saves, so I feel good," said Shin, who has won six times since the beginning of last season. "I'm a little bit tired. Today was a long day."

Shin is among a group of players who have signed up to go hang gliding following Saturday's third round. Although she is scared of heights, Shin says she will go through with the experience.

"Today on a couple of holes I saw the hang gliding," she said. "I told my caddy I want to cancel because it looks so scary. He said, 'It's fine, try it.' I will try it tomorrow."

Ochoa hit a seven-wood over the green at the 498-yard 18th hole but chipped in from 30 feet for her closing eagle. She won back-to-back Samsungs in 2006-07.

"It was for sure a little more of an up-and-down day like a roller coaster," said Ochoa. "(It's) funny because at the 18th hole, when I hit my driver in the fairway, I just told Greg, my caddy, 'I will make this eagle just to make more of an up and down round,' and we did, so it was kind of a funny way to finish."

Miyazato, who captured her first tour win at the Evian Masters in July, hit into a pond at the 18th hole and two-putted from eight feet for her closing bogey.

"I was a little bit ashamed," said Miyazato. "But it's not Sunday. I still have two days, so I think I will be all right."