PALM BEACH GARDENS, Fla. -- The day began with Rory McIlroy withdrawing due to pain in his wisdom tooth and ended with Luke Guthrie atop the leaderboard with two rounds to play in The Honda Classic.
Guthrie, a rookie on the PGA TOUR, shot 63 to get to 9 under and one shot clear of Michael Thompson.
Boo Weekley and Graham DeLaet are another shot back after shooting 67 and 68, respectively.
For McIlroy, it marks the third time this season he's failed to make it to the weekend after missing the cut in Abu Dhabi and failing to advance out of the first round of the World Golf Championships-Accenture Match Play Championship.
One of McIlroy's closest friends, Graeme McDowell will be playing this weekend.
McDowell shot 68 Friday and is one of six players at 6 under, along with Lee Westwood and Geoff Ogilvy.
Westwood, who moved to the area in the offseason, has finished in the top 10 here in two of the last three years.
Overnight leader Camilo Villegas.
The 2010 winner of this event, Villegas shot 77 -- a difference of 13 strokes from his opening round -- to miss the cut by a shot.
Other notables heading home early include Henrik Stenson, John Merrick, Ryo Ishikawa, David Duval and Paul Casey.