(CNN) -- American duo Paula Creamer and Jane Park both carded one-under par 71s to lead at the halfway stage of the HSBC Women's Champions event in Singapore on Friday.
Creamer takes shelter under an umbrella as she waits to play a shot in Singapore.
Creamer and Park had shared the opening round lead with Brazil's Angela Park and continued to set the pace in the $2 million LPGA Tour event.
World number one and defending champion Lorena Ochoa slipped to a one-over 73 on the second day and is in a three-strong group on two-under 142 ahead of the weekend.
Ochoa came into the event off the back of victory in Thailand last week as she bids to add to her 25 career wins on the LPGA Tour.
But Creamer, who won four times last season, is emerging as a major challenger at the top of the women's game and once again played confidently on the Tanah Merah County Club course.
"I feel very confident with where I'm at," Creamer told the tournament Web site www.hsbcgolf.com. "I feel like I've gained something today. The gap yesterday, there were people there, now there's not quite as many players close by."
Park is chasing her first win on the LGPA Tour, but realizes that a host of the game's top stars are in close contention. "I just want to take it one shot at a time, and that's exactly what I did," she said.
In-form Australian Katherine Hull and Korea's Mi Hyun Kim are one shot behind on five-under. Sun Young Yoo (Korea) and Japan's Ai Miyazato (72) are on four-under with SBS Open winner Angela Stanford, Lindsey Wright, Shanshan Feng and Se Ri Pak on 141.
Angela Park slipped to a four-over 76 in testing and humid conditions after recent heavy rainfall.