Yani Tseng drives from the fourth tee box Saturday morning at Ottawa Hunt. (Tom Hanson/Canadian Press)

Rookie Yani Tseng of Chinese Taipei leads the Canadian Women's Open by four strokes following Saturday's third round of 4-under par 68 at the Ottawa Hunt and Golf Club.

Tseng, winner of the LPGA Championship in June, leads South Korea's Se Ri Pak, who sits alone in second place at 10-under heading into the final round.

"Every week, I'm ready to win the tournament," said Tseng, who has pocketed $1.2 million US in her first year on the LPGA Tour.

"I finished second four times and I really learned a lot each time. I don't feel surprised because I keep learning and working hard and being relaxed."

Seventy-five competitors, including Tseng, spent the morning completing their second round, which was suspended by heavy rain and hail late Friday afternoon.

Tseng shot a course record 8-under in the two-day round, earning birdies on three of the final four holes to eclipse the mark set by tournament winner Martha Nause in 1994 and equalled by Australia's Katherine Hull on Friday.

"I feel great but I'm so tired," Tseng said. "It was such a long day and I had a headache, so I just tried to concentrate on every shot.

"I have to play my own game and not think too much," she said. "I have a four-shot lead, so there is a lot of room to play good."

Pak, a Hall of Famer who hasn't finished better than ninth this season, carded an identical 68 in the third round, including a hole-in-one with a six-iron on the 178-yard fifth hole.

It was the 15th hole-in-one on the LPGA Tour this season.

"It was a surprise to see it go in," Pak said. "Of course, you don't expect anything like that.

"That probably made my day. The last couple of months, I'm starting to play really well.

"I like the way I'm hitting the ball, but the putting is giving me a hard time. These greens are not easy, so when you start making some [putts] it gives you confidence."

Lorena Ochoa, the world's top-ranked golfer, birdied the 18th hole in posting a 2-over 74.

The Mexican sensation is tied for third at 8-under with Hull, who shot even-par 72.

Paula Creamer of the United States (70) and Song-Hee Kim of South Korea (71) share fifth overall.

American teenager Michelle Wie, who needs a Top 4 finish to retain her Tour card, is 2-under for the tournament following a 69.

"I'm making a lot more putts than I did the first day," said Wie, who opened with a 3-over 75.

"I feel like anything can happen on Sunday. All I can do is play the best I can and try to shoot a low score."

Alena Sharp of Hamilton, Ont., bogeyed three of the last five holes to balloon to 73, but she remains the top Canadian at 1-over.

"I'm out of contention to win now," Sharp said. "but I still feel I can shoot in the 60s out here and that would be a great way to finish — to get back into red numbers."

Charlottetown's Lorie Kane (73) is 4-over following a round of 73, Samantha Richdale of Kelowna, B.C. (75) is 5-over and Jennifer Greggain of Chiliwack, B.C. (74) is 6 over.

With files from the Canadian Press