On Si.com Mlb Power Rankings

This season SI's weekly ranking of all 30 teams looks different. Powered by Fangraphs, it's based not on opinion or the standings but on data, with teams slotted by Wins Above Replacement (WAR), a metric showing how valuable players are compared with replacement level. Here's a taste of this week's rankings (stats through Sunday), with the full list at SI.com/mlb.

1 RANGERS

WINNING %: Expected .837 Actual .813

TOTAL WAR: 13

ACTUAL WINS: 13

Josh Hamilton's impression of Babe Ruth has driven the Rangers' offense, the second best in baseball so far. They also have the third-lowest rotation ERA, and only six teams have allowed fewer balls in play to land for hits, which is a good sign for their defense. Being among the best at pitching, offense and defense tends to put you at the top.

2 CARDINALS

WINNING %: Expected .781 Actual .688

TOTAL WAR: 12

ACTUAL WINS: 11