| Acronym | Term | Definition | Formula(s) |
| 2B | Double | A hit where the batter safely reaches second base without assistance from an error and without advancing from first to second base due only to a fielder’s choice play. | |
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| 3B | Triple | A hit where the batter safely reaches third base without assistance from an error and without advancing from first or second base due only to a fielder’s choice play. | |
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| AB | At Bats | How many times a batter comes to the plate without taking a walk. | H+K+Outs |
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| AO | Air Outs | Outs resulting from FB. | |
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| Avg | Batting Average | Indicator of a hitter’s success rate. (Also BA) | H/AB |
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| BA | Batting Average | Indicator of a hitter’s success rate. (Also Avg) | H/AB |
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| BAA | Batting Average Against | Indicator of a Pitcher’s performance that measures how well hitters perform against that pitcher. | |
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| BABIP | Batting Average on Balls in Play | Also known as Hit Rate (H%), BABIP measures the percentage of balls that are hit into the field of play that result in a H, effectively measuring the impact of luck on performance (applies to both pitchers and batters). BABIP removes HR and K from the equation to focus on only balls hit fair and into play. The league average BABIP hovers around 0.300, so batters with a higher BABIP are likely to slump, while those with a lower BABIP are due for a hot streak. | For Batters: (H-HR)/(AB-HR-K+SF) |
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| BABIP | Batting Average on Balls in Play | Also known as Hit Rate (H%), BABIP measures the percentage of balls that are hit into the field of play that result in a H, effectively measuring the impact of luck on performance (applies to both pitchers and batters). BABIP removes HR and K from the equation to focus on only balls hit fair and into play. The league average BABIP hovers around 0.300, so batters with a higher BABIP are likely to slump, while those with a lower BABIP are due for a hot streak. | For Pitchers: (H-HR)/((IPx2.82)+H-K-HR) |
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| BB | Base-on-Balls | Walks, resulting from a PA that ends with a fourth called ball. | |
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| BB% | Walk Rate | Percentage of walks compared to how many times a batter appears at the plate. | BB/(AB+BB) |
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| BS | Blown Save | A BS is charged to an RP when he enters a game in a save-eligible situation and allows the tying run to score. Depending on the ultimate outcome of the game, said RP could also be charged with a Loss if the team loses the game, or he could be credited with a win if the team comes back in the next AB to win the game. | |
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| CG | Complete Game | A complete game is recorded when an SP throws every pitch from start to finish. | |
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| Cmd | Command | Sabermetric term that rates how well a pitcher is able to pitch stikes effectively. The higher the command ratio, the better the pitcher is performing. | K/BB |
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| CS | Caught Stealing | Failure to successfully steal a base. | |
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| CT% | Contact Rate | Measures how well a hitter is able to contact pitches and hit into the field of play. Hitters with high contact rates tend to perform well in BA. | (AB-K)/AB |
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| Ctl | Control | Sabermetric term that rates how well a pitcher controls the strike zone, measured as walks per nine innings (BB/9). | BB/IP*9 |
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| Dom | Dominance | Sabermetric term that rates how well a pitcher dominates batters, measured as strikeouts per nine innings (K/9). The best pitchers exhibit dominance rates of at least 6.0. | K/IP*9 |
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| ER | Earned Run | A run that was scored without the assistance of a defensive Error. | |
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| ERA | Earned Run Average | Measurement of the average number of ER a pitcher yields per nine IP. | (ER/IP)*9 |
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| Eye | Batting Eye | Indicator of a hitter’s ability to control the strike zone. High BA hitters will tend to be near or above 1.0. | BB/K |
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| FB | Flyball | | |
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| FB% | Flyball Percentage | FB% measures the percentage of balls hit in fair territory (inclusive of HR) by a batter that are flyballs. | |
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| GB | Groundball | | |
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| GB% | Groundball Percentage | GB% measures the percentage of balls hit in fair territory (inclusive of HR) by a batter that are groundballs. | |
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| GO | Ground Outs | Outs resulting from GB. | |
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| GO/AO | Ground Out/Air Out Ratio | | |
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| H | Hits | A situation where a batter makes contact with a pitch, driving it into fair territory, and reaches first base safely. | |
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| H/9 | Hits Per Nine IP | A measure of how many H a pitcher yields, normalized to nine innings for comparison purposes. | |
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| HR | Home Runs | Occurs when a batter makes contact with a pitch and drives the ball out of the park in fair territory, effectively driving all baserunners and the batter home for a run each. | |
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| HR/9 | Home Runs Per Nine IP | A measure of how many HR a pitcher yields, normalized to nine innings for comparison purposes. The best pitchers typically keep HR/9 below 1.0. | |
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| IP | Innings Pitched | How many outs a pitcher forces divided by three. For fractions of innings, IP uses 0.1 and 0.2 to indicate one or two outs, but not a complete inning. For example, if a pitcher goes six innings plus forces two outs in the seventh inning, he is credited with 6.2 IP. | |
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| K | Strikeout | When a batter accumulates three strikes in an AB, he is called out, resulting in a K for both the batter (received) and a pitcher (dealt). | |
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| L | Loss | A statistic that is charged to a pitcher when he yields the deciding run, whether earned or unearned, in any game. | |
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| LD | Line Drive | | |
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| LD% | Line Drive Percentage | LD% measures the percentage of balls hit in fair territory (inclusive of HR) by a batter that are line drives. | |
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| OBP | On-Base Percentage | Measures how often a batter reaches first base on H or BB as a percentage of total PA. Also OBA, for On-Base Average. | (H+BB)/(PA) |
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| OPS | OBP plus SLG | On-base Percentage plus Slugging Percentage (OBP + SLG) | ((H+BB)/PA) + (TB/AB) |
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| PA | Plate Appearances | How many times a batter appears as a hitter and completes a play, inclusive of all hits, outs, and walks. Appearances that are cut short due to another out (i.e. a pick off of a man on base) are omitted from PA. | AB+BB |
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| QS | Quality Start | Measure of a pitcher’s isolated pitching performance. A QS occurs when a pitcher starts the game, completes a minimum of six IP, and yields no more than three ER. | |
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| RP | Relief Pitcher | Any pitcher who is brought in after the game starts is an RP for that game. | |
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| S | Save | An RP, typically the closer, earns a save when the following conditions are met (as stated in the MLB rule book): - He is the finishing pitcher in a game won by his team
- He is not the winning pitcher
- He is credited with at least half of an inning pitched
- He satisfies one of the following conditions:
- He enters the game with a lead of no more than three runs and pitches for at least one inning
- He enters the game, regardless of the count, with the potential tying run either on base, at bat, or on deck
- He pitches for at least three innings
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| S% | Strand Rate | Percent of ER-eligible base-runners that a pitcher leaves on base when he successfully ends an inning with three outs. | (H+BB-ER)/(H+BB-HR) |
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| SB | Stolen Base | | |
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| SB% | Stolen Base Percentage | Percent of attempted SB that are successful | SB/(SB+CS) |
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| SLG | Slugging Percentage | Measures the power, or extra-base output of a batter. | TB/AB |
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| SP | Starting Pitcher | The person who throws the first official pitch in any given baseball game. | |
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| TB | Total Bases | Measure of how many bases a batter accumulates off of all hits, exclusive of advancement past first base due to defensive error or fielder’s choice. | H+2B+(3B*2)+(HR*3) |
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| W | Win | A statistic that is credited to the pitcher who is in the lineup when a team takes a lead that is never relinquished. For an SP to get a win, he must last at least 5 IP and leave with his team winning, followed by no subsequent tie or change in lead. Any pitcher who appears in a game can be credited with a win in the right circumstances. Since wins are highly dependent on run support, defense, and luck, it is a highly volatile statistic from year-to-year and very difficult to successfully predict. | |
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| WHIP | Walks & Hits Per Inning Pitched | Stat that keeps track of how many people pitchers allow on base via walk or hit in an average inning. High WHIP pitchers tend to have higher ERAs. | (BB+H)/IP |
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