Singapore (SportsNetwork.com) - Carlota Ciganda fired a 6-under 66 in Friday's second round and she joined Inbee Park atop the leaderboard at the HSBC Women's Champions.

Park, who shared the first-round lead with Yani Tseng, carded a 3-under 69 and she finished day two tied with Ciganda for the lead at 9-under-par 135. Park has 12 career victories, including five major championships, on the LPGA Tour, while Ciganda is seeking her first win.

Azahara Munoz, who was one of Ciganda's teammates on the victorious team Spain at last season's International Crown, shot a 5-under 67 and she is alone in third place at 7-under 137 on the Serapong Course at Sentosa Golf Club.

World No. 1 Lydia Ko, the winner of the Women's Australian Open two weeks ago, is still in the mix after shooting a 2-under 70 in her second round. Ko is tied for fourth with Stacy Lewis (69), Jenny Shin (70) and Karrie Webb (70).

Defending champion Paula Creamer rebounded from her 74 on Thursday, shooting a 1-under 71. She is tied for 36th at 1-over 145. Tseng carded a 3-over 75 in her second round and she dropped into a tie for 17th at 3-under 141.

After opening the week with four birdies and one bogey on Thursday, Ciganda shot up the leaderboard quickly Friday.

It didn't start out great for Ciganda, however, as she tripped to a bogey at the first. Then she got going with three birdies in a four-hole stretch on two, three and five.

Following a pair of pars on six and seven, Ciganda rolled in her fourth gain on the par-3 eighth.

Ciganda made the turn with back-to-back pars on nine and 10 before draining a pair of birdies on 11 and 12, getting her to minus-8.

After making two more pars, Ciganda tripped to her second bogey on No. 15, but she rebounded quickly and finished up her round with birdies on 16 and 18, vaulting her into a tie for the lead at the end of round two.

"I think I'm ready and I think it helps being here a few years," Ciganda said when asked if she feels ready to win. "So last year, I finished playing really good in the LPGA and LET. I'm confident, I'm happy, so I'm going to try my best. And if I win, good. And if I don't win, I just want to keep learning and just keep playing."

Park had a very quiet day up until the 14th hole. The No. 2 ranked player in the world did not make a birdie until the par-3 14th as she coasted to 13 straight pars from No. 1.

Finally Park made a birdie on No. 14 and she followed that up with another gain on 15. After back-to-back pars on 16 and 17, Park finished up her round with a gain at the last to complete her second straight bogey-free round. When it was all said and done, Park was still tied for the lead.

"I was lucky enough to hole the last three out of six holes, so I thought today was going to end with just no birdies," said Park. "Nothing wanted to drop today. It could have been a better day, but I'm really satisfied the way I finished, especially bogey-free through two days is a great result."

NOTES: Ciganda and Munoz were both members of the European Solheim Cup team that defeated the United States 18-10 in 2013 ... Lewis won this event in 2013, while Webb won in 2011 ... Ciganda's best finish this season was at last week's Honda LPGA Thailand, where she ended tied for 29th ... Park has finished in the top 10 at her last two events ... Park won three times last season. She also picked up her fifth major title at the 2014 LPGA Championship.