One stroke behind Woods and Briton Rose is a quartet of Americans -- Bo van Pelt, Steve Stricker, Matt Kuchar and Scott Piercy.

CNN: Woods and Rose share first round lead

American Bo van Pelt (66) finished alone in ninth on 11 under, one shot ahead of compatriots Matt Kuchar, Webb Simpson, Kevin Streelman and Jason Dufner.

CNN: Donald dispels doubts to regain top spot

Former World No.1 Lee Westwood made the biggest move of the day, tapping in from 17 inches on the final hole for a birdie to card a 65 and move to 11-under, the same mark as Bo Van Pelt.

CNN: STORY HIGHLIGHTS

In another twist, fellow American Bo Van Pelt had shot a 59 in the pro-am Wednesday, but it does not count for the record books, while Mickelson himself carded a 59 at the PGA Grand Slam of Golf in 2004, a four-man invitational tournament which does not count towards the official money list.

CNN: STORY HIGHLIGHTS