Further south in Detroit, Ryan Fox carded his worst round of the Rocket Mortgage Classic, with a four-over-par 76 seeing him end the day in a tie for 73rd.
Starting his day on the back nine, Fox made a steady start with a trio of pars, before back-to-back bogeys and another on the 18th saw him sitting three-over for the day with nine holes to play.
There was more of the same awaiting him in the second half of the day, though he was able to limit some of the damage caused by three further bogeys with birdies on the fifth and seventh.
As a result, Fox will have the earliest start time in the final round, teeing it up alongside Canadian Taylor Pendrith just after 11pm tonight (NZ time), while Ko and Kang begin their final round just after 1am tomorrow morning.