A first baseman, abbreviated 1B, is the player on a baseball or softball team who fields the area nearest first base, the first of four bases a baserunner must touch in succession to score a run. The first baseman is responsible for the majority of plays made at that base. In the numbering system used to record defensive plays, the first baseman is assigned the number 3.
Also called first sacker or cornerman, the first baseman is ideally a tall player who throws left-handed and possesses good flexibility and quick reflexes. Flexibility is needed because the first baseman receives throws from the other , the catcher and the pitcher after they have fielded ground balls. In order for the runner to be called out, the first baseman must be able to stretch towards the throw and catch it before the runner reaches first base. First base is often referred to as "the other hot corner"—the "hot corner" being third baseman—and therefore, like the third baseman, he must have quick reflexes to field the hardest hit balls down the foul line, mainly by left-handed and right-handed hitters hitting to the opposite field.
When first base is not occupied by a baserunner, the first baseman usually stands behind first base and off the foul line. The distance he plays from the base and foul line is dependent on the current hitter and any runners on base. The exact position may also depend on the first baseman's experience, preference, and fielding ability. For a known right-handed pull hitter, the first baseman might position himself further towards the second baseman's normal fielding position. For a known left-handed pull hitter, the first baseman will position himself closer to the foul line to stop a ball hit down the line.
To protect against a bunt on the first base side of the infield, the first baseman will position himself in front of the base and move towards the hitter as the pitch is thrown. As soon as the pitcher commits to throwing towards home plate, the first baseman will charge towards the hitter to field the bunt. During these plays, it is the responsibility of the second baseman to cover first base.
With a base runner present at first base, the first baseman stands with their right foot touching the base to prepare for a pickoff attempt. Once the pitcher commits to throwing towards home plate, the first baseman comes off the bag in front of the runner and gets in a fielding position. If the bases are loaded, or if the runner on first base is not a base stealing threat, the first baseman will position himself behind the runner and appropriate for the current batter.
When waiting for a throw from another player, the first baseman stands with their off-glove foot touching the base, then stretches toward the throw. This stretch decreases the amount of time it takes the throw to get to first and encourages the umpire to call close plays in favor of the fielding team. Veteran first basemen are known to pull off the bag early on close plays to convince the umpire that the ball reached their glove before the runner reached first base. The first baseman also has the responsibility of cutting off throws from any of the three outfield positions on their way to home plate. Though highly situational, the first baseman usually only receives throws from the center or right fielder.
A first baseman can theoretically also make an unassisted double play. There are two ways to achieve this. The first is by catching a line drive and returning to first base to tag the base before a baserunner can return. This is rare because the first baseman is usually slower than most baserunners who generally return to their bases on line drives near any fielder. The second is by getting an infield hit to the right when there is a runner on first, tagging the runner and returning to the first base in time to get the man running towards him.
The same advantages of being a right-handed throwing catcher, third basemen, shortstop or second basemen apply to the left-handed first baseman. These advantages surface in plays where the player is required to throw to another infielder after fielding a batted ball. In these instances, a right-hander will be required to turn more towards their target before throwing whereas a left-hander will usually already be positioned to make a throw. However, compared to the advantage for the right-handed throwing third baseman, shortstop, or second baseman, these advantages for the left-handed first baseman are minor because many balls hit to the first baseman are to their right, so that a right-handed first baseman fielding them backhanded does not need to turn after fielding a batted ball to throw it. In addition, a majority of plays only require the first baseman to receive a throw, not to field or throw himself. This is attributed to the overall majority of baseball players batting right-handed, and therefore, a majority of batted balls are hit to the left side of the infield and fielded by the third baseman or shortstop. Left-handed first basemen are also advantageous in attempting to pick off baserunners at first, as the left-hander can catch and tag in one motion, often doing both at the same time, while right-handed first baseman must sweep their glove across their body, costing them a crucial fraction of a second in applying the tag.
Since many throws to first base are made in great haste, the first baseman must be prepared to catch balls that are either high or low, as well as balls thrown quite a distance to either side, all while maintaining contact with the base (using one foot or the other). This requires a fair amount of agility and physical coordination. Among the most difficult plays a first baseman is normally required to make are the "short hop" and the "tag play", both of which are far easier to execute when the fielder is wearing the first-baseman's mitt rather than another type of glove.
According to Bill James, aside from pitchers and catchers, the most difficult defensive position to play is shortstop, followed by second base, center field, third base, left or right field (depending upon the ballpark), and finally first base as the easiest position. Anyone who can play another position on the field can play first base.
Lou Gehrig is an example of a player who played first base because he was not as strong a fielder as hitter. At or near the ends of their careers, good hitters are often moved to first base as their speed and throwing arms deteriorate, a more talented position player was acquired, or their teams become concerned with the likelihood of injury. Such players include Hall of Famers George Brett, Paul Molitor, Mike Schmidt and Jim Thome (third basemen), Ernie Banks (shortstop), Rod Carew (second baseman), Al Kaline (right fielder), Mickey Mantle (center fielder), Johnny Bench, Joe Mauer, and Mike Piazza (catchers), Stan Musial and Willie Stargell (left fielders). In 2023, Philadelphia Phillies all-star Bryce Harper moved from outfield to first base after undergoing Tommy John surgery; this enabled Harper to return to the field quicker than expected while also lessening the stress of throwing with his surgically repaired right arm. Only rarely does a player begin his major-league career at first base and go elsewhere, as with Jackie Robinson, a natural second baseman who was played at first base in his rookie season so that he would avoid the risk of malicious slides at second base. Hank Greenberg, a natural first baseman for the Detroit Tigers, moved to left field in his 11th major league season (1940) after his team acquired Rudy York, another slugging first baseman who was ill-suited to play anywhere else.
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