In case you haven’t heard, baseball season and the World Series are quickly approaching. If you’re not a regular baseball aficionado, even the box score of a game can look like a calculus exam. So I’ve broken down the 5 top offensive and defensive baseball stats so that you know what everyone’s talking about. (Yes, baseball is really all about stats…remember steamy Brad Pitt in Moneyball?)

**Offensive Terms:**

BA (Batting Average): Hits divided by at bats.

OBP(On Base Percentage): A formula that determines the number of times a player reaches base. (Hits + Base on Balls + Hit by Pitch) divided by (At bats + walks+ Hit by Pitch + Sacrifice Flies).

SLG (Slugging average): The total bases achieved on hits divided by at-bats.

RBI (Runs Batted In): The number of runners who score due to a batter’s batting action.

SB (Stolen Bases): The number of bases stolen successfully.

**Defensive Terms:**

ERA (Earned Run Average): The total number of earned runs (the number of runs that did not occur as a result of errors or passed balls), multiplied by 9, divided by innings pitched.

WHIP (Walks and Hits per Innings Pitched): The average number of walks and hits allowed by the pitcher per inning.

Defensive WAR (Wins Above Replacement): A formula to calculate the number of wins a player contributes to his team over a “replacement-level player.”

LOB% (Left on Base Percentage): The percentage of base runners a pitcher does not allow to score.

PO (Put Outs); The number of times the fielder tags, forces, or appeals a runner and he is called out as the result.

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