INCHEON CITY, South Korea - Zach Johnson of Cedar Rapids remained undefeated after four sessions of the Presidents Cup at Jack Nicklaus Golf Course.

Johnson teamed with Phil Mickelson for the third time and the duo defeated Adam Scott and Anirban Lahiri 3-and-2 in four-ball (best ball) play Saturday. Johnson and Mickelson sat out the third session, then improved to 2-0-1 in the competition.

Johnson and Mickelson both birdied the par-5 15th hole and pars at the 16th closed out the match.

The United States carries a 9 1/2-8 1/2 lead going into Sunday's singles session. All 12 players on each side will compete.

Johnson, ranked No. 10 in the world, will play No. 2 Jason Day at 9:03 p.m. (Iowa time) on Saturday. Day appeared in Johnson's charity tournament this summer at Elmcrest Country Club and won five tournaments in 2015, including the PGA Championship. Johnson won the British Open.