The 19-year-old has finished no worse than sixth in her three prior starts at this event, including a tie for second in 2014.
“At the end of the day, the winner here is going to be the one holing some putts,” said Ko, a double champion on the LPGA Tour this season who is seeking her 13th career title. “I just want to give myself a lot of opportunities around here.”
Ko lost in a playoff to Canadian Brooke Henderson at the KPMG Women’s PGA Championship two weeks ago, while the 28-year-old Pressel is seeking her first LPGA victory since October 2008.
“Hopefully, I’ll get a good night’s sleep and come out and do my thing tomorrow,” said Pressel, who finished birdie-birdie.
The co-leaders have a two-shot advantage over Canadian Alena Sharp (65), China’s Jing Yan (65) and Candie Kung (66) of Taiwan heading into Sunday’s final round.
(Reporting by Tim Wharnsby in Toronto- Editing by Mark Lamport-Stokes)
