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La Quinta, CA (Sports Network) - Roberto Castro and rookie James Hahn both carded a 5-under 67 on Friday to retain a share of the lead after two rounds of the Humana Challenge.

Macon's Russell Henley carded a three under par 68 and trails the leaders by three shots halfway through the tournament.

Henley had four birdies and an eagle during his round on Friday. The eagle came on the Par 5 sixth hole at the Palmer Course at PGA West.

Henley won last week's tour opener in Hawaii.

Castro and Hahn, who are both seeking their first PGA Tour victory, sit at 14- under 130 through 36 holes. Darron Stiles, Scott Stallings and Richard H. Lee all fired 65 and moved into a tie for third place at minus-13.

Jason Kokrak shared the first-round lead with Castro and Hahn, but he shot 69 on Friday and fell into a tie for sixth place with eight others, including Zach Johnson, at 12-under.

Phil Mickelson improved on the second day after carding an opening-round 72 in his season debut. The lefty, who is recovering from flu-like symptoms, carded seven birdies against a pair of bogeys en route to a 67 on Friday.