Carl Crawford and Adrian Gonzalez are the highlighted names, but virtually every move Theo Epstein made this winter made good sense and improved the team. Boston now boasts a roster deeper and better-balanced than any other in the American league, and perhaps better than any other in baseball.
Still, there are dozens of things that could go wrong for a team with even this degree of depth. Epstein undertook this project because of the long and frustrating collapse of a team that had the talent to win the division last year. This team has every opportunity to win the division, and then the pennant, and then the World Series. For all that to happen, though, these 10 things need to go right.
This is the fourth in a series of pieces listing 10 things that would have to go right for each MLB team to win a pennant this season. To find out when your favorite team's article comes out, follow me on the twitter @MattTrueblood, or sign up for your team's Bleacher Report newsletter.