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A baseball defense puts nine players on the field, and each position has a different job. Some positions are built around range and reaction time, others around arm strength, receiving, footwork or controlling the running game. Understanding those roles makes almost every play easier to read.
The nine defensive positions
- Pitcher (1)
- Catcher (2)
- First baseman (3)
- Second baseman (4)
- Third baseman (5)
- Shortstop (6)
- Left fielder (7)
- Center fielder (8)
- Right fielder (9)
The numbers in parentheses are the traditional scoring numbers used to record defensive plays. For example, a 6-4-3 double play means the shortstop fielded the ball, threw to the second baseman for one out, and the second baseman threw to first for the second out.
Pitcher
The pitcher starts each play by delivering the ball to home plate. Beyond trying to retire hitters, pitchers control tempo, change speeds and locations, hold runners close and field balls hit around the mound. Modern staffs divide work among starters, middle relievers, setup pitchers and closers.
Catcher
The catcher works behind home plate, receives pitches, blocks balls in the dirt and throws to bases to challenge would-be base stealers. Catchers also coordinate closely with pitchers and coaches on pitch selection and game planning. Because they see the whole field, they often direct defensive communication.
First baseman
The first baseman plays near first base and handles a huge volume of throws from other infielders. Good first basemen combine reliable hands, footwork around the bag and the ability to scoop low throws. They also field grounders, hold runners and start or finish double plays.
Second baseman
The second baseman covers the right side of the middle infield. Quick lateral movement, fast transfers and double-play footwork are especially important. Because many throws to first are shorter from this side of the diamond, the position usually emphasizes quickness and coordination more than pure arm strength.
Third baseman
Third base is sometimes called the hot corner because hard-hit balls can reach the defender quickly. Third basemen need fast reactions and enough arm strength to make long throws across the diamond. They also charge bunts and handle plays near the third-base line.
Shortstop
Shortstop covers the left side of the middle infield and is often one of the defense’s most athletic players. The role demands range, footwork, strong throws from different angles and communication with the second baseman on double plays and coverage.
Left fielder
The left fielder covers the left side of the outfield from the defense’s perspective. Corner outfielders must track fly balls, cut off hits into the gaps and make accurate throws back to the infield. Left field generally requires less throwing distance to third base than right field.
Center fielder
Center field typically demands the most range in the outfield. The center fielder covers the middle and often takes priority on catchable fly balls when two outfielders converge. Speed, reads off the bat and a strong throwing arm are major assets.
Right fielder
The right fielder covers the right side of the outfield and often needs a powerful arm because throws to third base can be among the longest routine outfield throws. Like the other outfielders, the right fielder must read contact, cover gaps and limit extra bases.
What about the designated hitter?
The designated hitter is an offensive lineup role rather than one of the nine defensive positions. The DH bats in place of the pitcher under MLB’s universal designated-hitter rule. A player can therefore be a major part of a team’s offense without taking a defensive position in the field that day.
How modern positioning changes the picture
Teams still use the same basic positions, but fielders move within their legal areas based on hitter tendencies, game situation and scouting. MLB limits full infield shifts by requiring four infielders on the dirt with two on each side of second base when the pitch is delivered, but strategic shading is still common.
If you are learning the sport from scratch, pair this guide with our innings and outs explainer and our MLB postseason guide. You can also browse the MLB & Baseball hub.
Official references
Position roles were checked against MLB’s official Glossary and Baseball Savant fielding-alignment references. Featured image: Jose Morales / Unsplash; generic baseball imagery, not a specific MLB game.