Hull, who won the Australian Ladies Masters last month, had an 11-under 205 total on the Tanah Merah Country Club, where play was suspended for 2 hours, 19 minutes because of lighting and heavy rain.
Im liking the fact I have a two-shot lead, and Im confident in how Im playing, Hull said. So game on.
Sun Young Yoo (68) was a stroke back of Stanford and a shot ahead of Korean compatriot Mi Hyun Kim (70), with second round co-leader American Paula Creamer (72) five strokes off the lead.
Creamer was disappointed with her round.
I didnt hit it very well and didnt putt well at all. I didnt have any speed or anything that got any momentum going, Creamer said. Hopefully I can start off well and then maybe make (Hull) nervous and try and put some pressure on the leaderboard.
Stanford shot a bogey-free 66 to move into position for her fourth victory in her last nine starts. The sixth-ranked Texan won the season-opening SBS Open in Hawaii after closing last season with two victories in her final six events. In addition to the three wins, she has five other top-seven finishes in her last eight tournaments.
Stanford got her sixth birdie of the round on 16 to move into a tie for the lead with Hull at 9 under. But Hull made birdies on Nos. 16 and 18 with accurate approach shots. She hit a wedge to 7 feet on No. 16 and hit a 5-iron to 4 feet on the par-4, 414-yard 18th hole.
Hull could win her second LPGA event Sunday. She won the Canadian Womens Open last summer.
I probably wont watch the leaderboard a whole lot tomorrow, she said. Im probably going to go out there wanting to think about my golf game. The things that worked for me in the past. I just want to treat it as another day in the office and go out there and do my best.
Top-ranked Lorena Ochoa, the defending champion coming off her 25th LPGA victory last week in Thailand, shot a 69 to top a group 5 under. Hall of Famer Juli Inkster (69), fifth-ranked Jiyai Shin (66), Amy Yang (69) and Jane Park also were 5 under.
I want to win and I believe its possible so I need to be more aggressive tomorrow, get some birdies early and hopefully continue the momentum, Ochoa said.