Micheel and Maruyama were tied at 7-under 64 with Hank Kuehne, the longest driver on the tour, turning in a 65 at the famed Riviera Country Club course.
Woods had to settle for a 1-over 72, placing his record streak of cuts made in jeopardy. He will likely have to fire a 70 Friday to survive the cut. Leading money winner Vijay Singh opened with a 71.
Micheel, who outdueled Chad Campbell last summer to become the surprise winner of the PGA, had an eagle and six birdies in his round Thursday.