Thousand Oaks, US: Zach Johnson got hot on a chilly Southern California day on Thursday to seize a one stroke lead in the World Challenge, with tournament host Tiger Woods four adrift. (Read: I've been influenced by Nelson Mandela, says Tiger Woods)
Johnson, a two-time runner-up in this event, had seven birdies in his five-under par 67. He was one shot in front of Matt Kuchar, whose four-under 68 was highlighted by an eagle at the par-five 11th.
Hunter Mahan and Bubba Watson shared third on 70, followed by Woods on one-under 71 -- the only players in the elite 18-man field for the unofficial event under par.