Best arrival: Will Middlebrooks
Middlebrooks entered the season as the Red Sox' top prospect (according to Baseball America) and the third baseman of the future, but his sizzling start at Pawtucket accelerated the timetable to third baseman of the present. In 100 at-bats with the PawSox, he hit 9 homers with an OPS of 1.057. He made his big league debut May 2, homered in his third game, then hit two more in his fourth. Soon, incumbent third baseman Kevin Youkilis was former Red Sox third baseman Kevin Youkilis.