HILTON HEAD, S.C. -- Camilo Villegas withdrew before his second round on Friday, citing a back injury.

Villegas shot a 79 in the opening round. Prior to this week, Villegas had missed the cut in four of his last five starts.

He is the second player to withdraw this week. Sang-Moon Bae withdrew with a shoulder injury following an 83 in the first round.