Baseball No. 1: Pitcher

Responsibilities: The core of defense, responsible for pitching and suppressing batters, mastering a variety of ball paths such as fast balls, curveballs, and slides, and coordinating the defensive tactics of the whole team.

Characteristics: Requires strong mental quality, ball control accuracy and physical fitness, and modern baseball is often divided into starting pitchers, relay pitchers and finishers.

Celebrity:

Nolan Ryan: Record holder with seven no-hits.

Shohei Ohtani: A rare contemporary "two-knife stream" (pitching and double repair), 2021 American League MVP.

Baseball No. 2: Catcher

Responsibilities: Catching pitchers pitching, directing defensive positions, and stopping runners from stealing bases, requires full-court insight.

Characteristics: Requires a strong physique (to withstand frequent squatting), tactical acumen and quick reflexes.

Celebrity:

Yogi Berra: 18-time All-Star, 10 World Series rings.

Iván Rodríguez: winner of 13 Golden Glove Awards.

Baseball No. 3: First Baseman

Responsibilities: Respond to infield passes to block runners, and be good at handling bouncing balls.

Features: Height and long arms are good for receiving the ball, and are often played by strong hitters.

Celebrity:

Lou Gehrig: Record holder for 2,130 consecutive races (56 years before it was broken).

Albert Pujols: 700+ Home Run Club member.

Baseball No. 4: Second Baseman

Responsibilities: Assist in defending first base/guerrilla zone, participate in double-kill tactics, and need to flexibly turn and pass.

Features: Agility is a priority, and it has a certain ability to strike.

Celebrity:

Roberto Alomar: 10 Golden Gloves, .300 career batting average.

Joe Morgan: 70s Redskins core, two-time MVP.

Baseball No. 5: Third Baseman

Responsibilities: Defend the "hot corner" (the area where the ball is hit), and react quickly to deal with the fast flat ball.

Characteristics: Requires excellent reflex nerve and arm strength, often performed by strength beaters.

Celebrity:

Mike Schmidt: 548 home runs, 10 Golden Gloves.

Brooks Robinson: Known as the "human vacuum."

Baseball No. 6: Shortstop

Responsibilities: Defend the largest area, be responsible for the area around second base, and coordinate the infield defense.

Features: The position with the highest comprehensive requirements, both speed, arm strength, and judgment is required.

Celebrity:

Derek Jeter: Five-time World Series Champion, 3,000 hits club.

Ozzie Smith: 13-seat Golden Glove, known for his defensive art.

Baseball No. 7: Left Fielder

Duties: Handle high flying balls in the left field, block runners with long passes.

Features: The arm strength requirement is second to that of the right fielder, but the trajectory of the ball needs to be judged.

Celebrity:

Ted Williams: All-time leader in .482 career base averages.

Barry Bonds: Single-season 73 hits record holder (controversy alongside).

Baseball No. 8: Center Fielder

Responsibilities: Cover the largest outfield position and direct the outfield defensive formation.

Characteristics: Speed and judgment are crucial, and he is often the team's top defender.

Celebrity:

Willie Mays: The classic defensive maker of "The Catch".

Mike Trout: Hyundai all-rounder, 3-time MVP.

Baseball No. 9: Right Fielder

Duties: Requires the strongest arm strength, blocks third base runners, and handles the ball on the right field.

Features: The accuracy of long passes is the highest, and strong beaters are often arranged.

Celebrity:

Babe Ruth: A pitcher-turned-legend, second in career OPS 1.164 all-time.

Ichiro Suzuki: Known for outfield assists, the record holder of 262 hits in a single season.

Modern baseball places more emphasis on shifting, such as moving shortstops to the right half for left-hand strikers.

The spread of the Designated Strike (DH) system has changed the division of roles among pitchers.

Data-based analytics drive defensive positioning optimization, such as the Statcast system, which tracks player movement efficiency.

These positional divisions exemplify baseball's philosophy of balanced offense and defense, with the infield emphasizing precise coordination, the outfield testing space control, and the shooting and catching combination at the heart of the tactical game.