Third baseman in the context of "Brian Anderson (third baseman)"

In the sport of baseball, each of the nine players on a team is assigned a particular fielding position when it is their turn to play defense. Each position conventionally has an associated number, for use in scorekeeping by the official scorer: 1 (pitcher), 2 (catcher), 3 (first baseman), 4 (second baseman), 5 (third baseman), 6 (shortstop), 7 (left fielder), 8 (center fielder), and 9 (right fielder). Collectively, these positions are usually grouped into three groups: the outfield (left field, center field, and right field), the infield (first base, second base, third base, and shortstop), and the battery (pitcher and catcher). Traditionally, players within each group will often be more able to exchange positions easily (that is, a second baseman can usually play shortstop well, and a center fielder can also be expected to play right field); however, the pitcher and catcher are highly specialized positions and rarely will play at other positions.

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 infielders, 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 base—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 pull hitters and right-handed hitters hitting to the opposite field.

Shortstop, abbreviated SS, is the baseball or softball fielding position between second and third base, which is considered to be among the most demanding defensive positions. Historically, the position was assigned to defensive specialists who were typically poor at batting and were often placed at the bottom of the batting order. Today, shortstops are often able to hit well and many are placed at the top of the lineup. In the numbering system used by scorers to record defensive plays, the shortstop is assigned the number 6.

More hit balls go to the shortstop than to any other position, as there are more right-handed hitters in baseball than left-handed hitters, and most hitters have a tendency to pull the ball slightly. Like a second baseman, a shortstop must be agile, for example when performing a 4-6-3 double play. Also, like a third baseman, the shortstop fields balls hit to the left side of the infield, where a strong arm is needed to throw out a batter-runner before they reach the safety of first base.

Peter Edward Rose Sr. (April 14, 1941 – September 30, 2024), nicknamed "Charlie Hustle", was an American professional baseball player and manager. He played in Major League Baseball (MLB) from 1963 to 1986, most prominently as a member of the Cincinnati Reds lineup known as the Big Red Machine for their dominance of the National League in the 1970s. He also played for the Philadelphia Phillies, where he won his third World Series championship in 1980, and had a brief stint with the Montreal Expos. He managed the Reds from 1984 to 1989.

Rose was a switch hitter and is MLB's all-time leader in hits (4,256), games played (3,562), at-bats (14,053), singles (3,215), and outs (10,328). He won three World Series championships, three batting titles, one Most Valuable Player Award, two Gold Glove Awards, and the Rookie of the Year Award. He made 17 All-Star appearances in an unequaled five positions (second baseman, left fielder, right fielder, third baseman, and first baseman). He won two Gold Glove Awards when he was an outfielder, in 1969 and 1970. He also has the third longest hit streak in MLB history at 44, and remains the last player to hit safely in 40 or more consecutive games.