Nicole Broch Larsen shot her second consecutive 6-under 66 on Friday for a one-shot lead over top-ranked Jin Young Ko midway through the CP Women's Open.

Broch Larsen, who started on the back nine, birdied three of her last four holes to push ahead of Ko and post 12-under 132 at Magna Golf Club. Ko shot a bogey-free 67.

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Jin Young Ko, of South Korea, prepares to tee off on the first hole during the second round of the CP Women's Open in Aurora, Ontario, Friday, Aug. 23, 2019. (Frank GunnThe Canadian Press via AP)

Nicole Broch Larsen shot her second consecutive 6-under 66 on Friday for a one-shot lead over top-ranked Jin Young Ko midway through the CP Women's Open.

Brittany Altomare watches her tee shot on the first hole during the second round of the CP Women's Open in Aurora, Ontario, Friday, Aug. 23, 2019. (Frank GunnThe Canadian Press via AP)

Defending champion Brooke Henderson of Canada was three shots back after a 69 along with Pajaree Anannarukarn (69) and Yu Liu (67). Amy Olson, who has an outside shot at making the U.S. Solheim Cup team in the final week of qualifying, had a 68 and was another shot behind.

Canada's Brooke Henderson blasts out of the bunker on the 14th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson blasts out of the bunker on the 14th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson greets fans on the 16th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson greets fans on the 16th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson hits her tee shot on the 12th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson hits her tee shot on the 12th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Broch Larsen, of Denmark, is winless in three seasons on the LPGA Tour and came in 89th in the points standings.

Jin Young Ko, of South Korea, prepares to tee off on the first hole during the second round of the CP Women's Open in Aurora, Ontario, Friday, Aug. 23, 2019. (Frank GunnThe Canadian Press via AP)

Jin Young Ko, of South Korea, prepares to tee off on the first hole during the second round of the CP Women's Open in Aurora, Ontario, Friday, Aug. 23, 2019. (Frank GunnThe Canadian Press via AP)

Defending champion Brooke Henderson of Canada was three shots back after a 69 along with Pajaree Anannarukarn (69) and Yu Liu (67). Amy Olson, who has an outside shot at making the U.S. Solheim Cup team in the final week of qualifying, had a 68 and was another shot behind.

Brittany Altomare, who currently holds the eighth and final U.S. Solheim Cup qualifying spot on points, holed a wedge from the fairway for eagle on the par-5 12th and holed a bunker shot for another eagle on the par-5 14th. But she double-bogeyed the par-3 17th and settled for a 66 to finish at 7 under.

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Brittany Altomare watches her tee shot on the first hole during the second round of the CP Women's Open in Aurora, Ontario, Friday, Aug. 23, 2019. (Frank GunnThe Canadian Press via AP)

Brittany Altomare watches her tee shot on the first hole during the second round of the CP Women's Open in Aurora, Ontario, Friday, Aug. 23, 2019. (Frank GunnThe Canadian Press via AP)

Canada's Brooke Henderson blasts out of the bunker on the 14th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson blasts out of the bunker on the 14th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson greets fans on the 16th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson greets fans on the 16th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson hits her tee shot on the 12th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)

Canada's Brooke Henderson hits her tee shot on the 12th hole during the second round of the CP Women's Open golf tournament in Aurora, Ontario, Friday, Aug. 23, 2019. (Nathan DenetteThe Canadian Press via AP)