Tammie Green and Lorie Kane share fourth place at 10-under par while Jill McGill and Maria Hjorth are four shots off the pace at minus-nine.
One day after 35 mile per hour winds played havoc with the second-round scoring at the South Course at Angus Glen Golf Club, the wind died down and scores went low.
'It's the difference between night and day with the wind,' said Sorenstam, who is looking for her sixth win of the 2001 campaign. 'Today was a great day for scoring. I'm glad I was able to take advantage of it.'
Click here for Annika Sorenstam's scorecard.
Sorenstam used a birdie run at the end of her round to get to the top of the leaderboard. At No. 15, she hit a sand-wedge to five feet to set up birdie and reached the par-5 16th in two with a 7-iron and two-putted for birdie.
The Swede hit a 9-iron to six feet at Angus Glen's closing hole for a final birdie to get to 13-under, but she wouldn't have a piece of the lead until Robbins stumbled down the stretch.
At the par-3 17th, Robbins hit a 6-iron into a greenside bunker and blasted out to 20 feet. She failed to get up and down to save par, then repeated the process at No. 18 for a bogey-bogey finish.
'I felt a little tired out there and it caught up with me on 17 and 18,' Robbins said. 'I'm glad I didn't have any more holes to play.'
Robbins opened a big lead after three consecutive birdies on the front side. She holed a 10-footer at the par-3 sixth and two-putted the seventh green for birdie.
Robbins, who led with Jones after Friday's second round, wedged her approach to 20 feet at No. 11 to set up a birdie and extend her lead to four.
'I'm looking forward to tomorrow,' said Robbins, who has not won on tour since the season-opening event in 1999. 'I'm still in a good position and lot of people are playing real well and we should have a really good finish on our hands tomorrow.'
Sorenstam flew out of the gates at the beginning of the year with five wins, including four in a row. She won a major and fired a 59, a first on the LPGA Tour, but she has not won since the Chick fil-A Charity Championship in early May.
'I haven't won in a while, so I'm a little hungry,' said Sorenstam.
Women's British Open champion Se Ri Pak, a first-round co-leader before falling back with an even-par 72 on Friday, shot 71 Saturday and is alone in eighth place at eight-under par.
Barb Mucha (68), Kristal Parker (68) and Cristie Kerr (71) share ninth at minus-seven.
Full-field scores from the Bank of Montreal Women's Canadian Open