The duo finished their second rounds Saturday morning and sit at 11-under through 36 holes.
J.B. Holmes is alone in third at 10-under.
Rory McIlroy recorded the lowest score of Round 2, soaring up the leaderboard into a tie for eighth with his 8-under 63.
Players will begin Round 3 at 6:00 p.m. ET and play until dark.