SCOTTSDALE, Ariz. -- Webb Simpson committed to play the Phoenix Open on Friday, giving the tournament 21 of the top 50 players in the world ranking.
Simpson, the 2012 U.S. Open champion, is ranked 19th.
Defending champion Phil Mickelson, at No. 4, is the top-ranked player entered in the event that begins Thursday at TPC Scottsdale. The former Arizona State star, also the 1996 and 2005 winner, withdrew from the Farmers Insurance Open at Torrey Pines on Friday night because of muscle pain in his back.
No. 12 Ian Poulter also is set to play along with No. 14 Brandt Snedeker, No. 22 Keegan Bradley (22), No. 24 Hideki Matsuyama, No. 26 Lee Westwood, No. 28 Bill Haas, No. 30 Bubba Watson, No. 33 Ryan Moore, No. 34 Nick Watney, No. 35 Hunter Mahan, No. 36 Gonzalo Fernandez-Castano, No. 38 Kevin Streelman, No. 39 Graham DeLaet, No. 40 Billy Horschel, No. 41 Patrick Reed, No. 44 Martin Kaymer, No. 46 Harris English, No. 48 Jonas Blixt and No. 49 Chris Kirk. Reed won the Humana Challenge last week in La Quinta, Calif.
Former LSU star John Peterson received the last of five sponsor exemptions Friday, following Kevin Tway, Ricky Barnes, Joe Ogilvie and Kiradech Aphibarnrat. Local instructor Paul Trittler earned the Southwest Section of the PGA's spot by winning the section title.
Three spots are available in qualifying Monday at McCormick Ranch.