Louis Oosthuizen, the No. 8 player in the world golf rankings and top-rated player on the commitment list for this week’s Crowne Plaza Invitational at Colonial, withdrew today because of a neck injury sustained while competing at last week’s HP Byron Nelson Championship.He has been replaced in the Colonial field by Stuart Appleby.Oosthuizen, the 2010 British Open champion, withdrew from the Nelson before Sunday’s final round despite being in 32nd place after 54 holes. But Oosthuizen, who slipped from seventh to eighth in today’s updated rankings, did no officially withdraw from Colonial until today.Ooshuizen’s departure means the Colonial field will not feature any of the world’s top 10 golfers in 2013. The highest-ranked Colonial competitor will be Matt Kuchar, No. 13 in today’s updated rankings.Charl Schwartzel, the 2011 Masters champion who will be making his Colonial debut, climbed two spots to No. 15 in the world rankings after finishing third at the Nelson. Rounding out Colonial’s list of top-30 players from the world rankings are Jason Dufner (No. 20), Hunter Mahan (No. 21), Bo Van Pelt (No. 26), Jim Furyk (No. 27), defending champ Zach Johnson (No. 29) and Rickie Fowler (No. 30).In another field tweak, D.A. Points withrew and was replaced by D.J. Trahan. No reason was given for Points' withdrawal.