As good as the round was, however, it did not match her all-time best at the par-71 layout in Sylvania, Oh.
Pak shot a course record 61 here in the second round of 98. She would win that year, and also again in 1999.
Friday, she moved two ahead of the field through 36 holes at 10-under-par 132.
Heather Bowie shot a 66 to move into outright second at 8-under, while Carin Koch also shot 66 to be at minus-seven through two rounds.
The day truly belonged to Pak, however, who is searching for her second win on the tour this season.
Check out Se Ri Pak's scorecard!
Starting her round on the back nine, Pak got it going immediately, pouring in 15-footers for birdie at Nos. 10 and 11. She then birdied the seventh, eighth and ninth holes to go out in minus-five.
Four more birdies ' all under 10 feet due to precise iron play ' on the front nine, and she had a perfect 61.
Always here, I have good memory on every hole, exclaimed Pak following her terrific round. All day, all week, every year I play here.
Sounds like trouble for the rest of the field.
Said Koch, who played with Pak on Friday: When you see there are birdies being made, its easier to believe you can make them yourself. She made some long putts early, but it wasnt until the back nine when she was kind of like radar. She was hitting everything close.
Full-field scores from the Jamie Farr Kroger Classic