South Korea's Jenny Shin has the halfway lead in the LPGA Tour's Kia Classic, a stroke ahead of top-ranked New Zealander Lydia Ko and American Brittany Lang.
Shin birdied five of her first eight holes and had a seven-under 65 to reach 10-under 134 at Aviara in the final event before the major ANA Inspiration next week in Rancho Mirage.
"It was a really good round," Shin said.
"I hit great shots. I hit great putts. I had a lot of six-footers for birdie, so it was a good day. I think I did a good job placing my ball in the right position and getting the right clubs."
The 23-year-old South Korean player is winless on the LPGA Tour.
"I certainly see myself improving every year," Shin said.
"I feel like in every aspect of the game I'm improving just a little bit."
Ko shot a 67, and Lang had a 68.
"I didn't strike the ball as well as I did yesterday, especially on my back nine. I had to make up-and-down from a few places," Ko said.
"The rough is rough, so when you get in there, it's tough to get close to the pin or even on the green sometimes. Sometimes I got fortunate, but other times I was able to scramble and I think that's the most important thing around here."
18-year-old Ko was second Sunday in Phoenix in the Founders Cup.
"I can't believe our first major is already around the corner next week," Ko said.
"This is a great swing of events, the Founders Cup, Kia Classic and, obviously, the ANA Inspiration.
"I haven't played as best as I think I could have at ANA, and I think my personal goal is to try and have my personal-best finish."
Lang is coming off a ninth-place tie in Phoenix.
"It feels really good, especially to have a bogey-free round out there in the afternoon," Lang said.
Second-ranked Inbee Park and fellow South Korean player Hyo Joo Kim are eight-under.
The best-placed Australian is Minjee Lee, who followed up her opening round 69 with an even par 72 to be three-under for the tournament and six shots off the lead in a tie for 19th.
Karrie Webb is two shots further back at one-under in a tie for 29th.
