Del Ballard Jr., who owns 10 professional titles, moved into the overall lead in the men's division Thursday with a 27-game pinfall of 6,047.
Shannon O'Keefe, leads the women with 5,843. Ballard holds a slim lead over Derek Eoff, who is second just nine pins back while John Janawicz is 18 pins off the lead.
Tina Stickney, who had a string of 18 games of 200 or better dating back to Tuesday, moved into second place, trailing O'Keefe by 29 pins. Competition concludes Friday with the last of four nine-game blocks.