Cauley is looking for his first PGA Tour victory in what has had a solid opening season on the circuit. He has had four Top 10 finishes, including a 2012-best third place at the Wyndham Championship, and he stands 42nd on the money list.
Johnson was one of only three Americans on the 12-man team to win his singles match at last month's Ryder Cup while the European squad was rallying to a one-point victory.
Jim Furyk, another member of that team, shot a 66 Thursday and was tied for 15th place.
Beautician charged with giving client fatal silicone butt injection
Handler slams Piers Morgan: 'You're a terrible interviewer'