rtokens: Phil Mickelson , the only four-time winner on the PGA Tour , skipped the tournament after winning the World Series of Golf last week .
pos: VBG NN NNP NNP VBD DT JJ CD CC VBD CD NNS RB .
tokens: Defending champion Scott Hoch shot a three-under 68 and was six strokes back .
ltokens: Woods was among a group of 13 players at four under , including 1993 champion Billy Mayfair , who tied for second at last week 's World Series of Golf , and former U.S. Open champ Payne Stewart .