Schmid went bogey-free on his day, steadily climbing the board with each of his seven birdies until he matched Griffin for the low round of the day and the 36-hole lead. Pak, to his credit, hung in all day and is just two back of the lead after a gutty 68 that included a birdie at the 18th to move into solo third.

On No. 10 the 2016 Charles Schwab Challenge champion sank a 28-foot birdie putt to cross over to safety. Then bogeys at No. 13 and 15 had Spieth in need of a birdie on the closing holes. He got it at No. 17, nestling his approach 6 feet from the cup and sinking the putt for a 71 to go to even-par for 36 holes.

The Charles Schwab Challenge rolls into Saturday at Colonial Country Club for Round 3 of the PGA Tour's event in Ft. Worth, Texas. Here's a look at tee times and groupings (click here for how to watch