Zach Johnson and Jimmy Walker in contention in Maui

USA Ryder Cup teammates Zach Johnson and Jimmy Walker have moved into a four-way tie for the lead after round two of the Hyundai Tournament of Champions in Hawaii.

Johnson picked up seven birdies and dropped only one shot in a round of 67 to move to 11-under par in Maui.

Walker, who made his first Ryder Cup appearance at Gleneagles last autumn, followed up his 67 on day one by going four-under par for his first nine holes, but only picked up a further shot before reaching the clubhouse.

First-round leader Russell Henley made steady progress with a round of 70, boosted by three birdies on the back nine.

Korean Sang-Moon Bae had a bogey-free 18 holes as he also moved to 11-under and a share of the lead going into round three on Sunday.