Aaron Cook made his first start for the Red Sox on Saturday, lasting less than two innings because of a bizarre injury. Cook retired the first two batters in the second inning before Chris Davis reached base on a single. Baltimore's Wilson Betemit followed suit, moving Davis to third before a passed ball by catcher Jarrod Saltalamacchia allowed Davis to score. Cook was injured on the play as he slid into home plate knees first in an attempt to tag out Davis, whose cleats spiked Cook in the left leg and left a visibly deep, bleeding gash. The right-hander left the field temporarily, as manager Bobby Valentine called for Clayton Mortensen out of the bullpen, but Mortensen never reached the pitcher's mound. Cook received treatment in the clubhouse and returned minutes later to record the final out. He was charged with seven runs (six earned) on eight hits, walking one and striking out none after a rough third inning.