Baseball Curveball

• Outline
  • Rules
  • Baseball field
  • Equipment
  • Player rosters
  • Non players
  • Distinctive elements
  • Defensive Players
    • Pitcher (P)
    • Catcher (C)
    • First Baseman (1B)
    • Second Baseman (2B)
    • Third Baseman (3B)
    • Shortstop (SS)
    • Left Fielder (LF)
    • Center Fielder (CF)
    • Right Fielder (RF)
  • Offensive Players
    • Batter
    • Runner
    • Designated Hitter
    • Pinch Hitter
    • Pinch Runner
    • Lead Off
    • Lead Off Hitter
    • Cleanup Hitter
• Gameplay
  • Defensive Play
  • Offensive Play
  • Batting order (1-9)
  • Strategy and tactics
  • Game progress
  • Batting
  • Pitching
  • Base running
  • Fielding

The curveball is a type of pitch in baseball thrown with a characteristic grip and hand movement that imparts forward spin to the ball, causing it to dive in a downward path as it approaches the plate. Its close relatives are the slider and the slurve. The "curve" of the ball varies from pitcher to pitcher. Outside the context of baseball, variants of the expression "to throw a curveball" essentially translate to introducing a significant deviation to a preceding concept.

Grip and action

The curveball is gripped much like a cup or drinking glass is held. The pitcher places the middle finger on and parallel to one of the long seams, and the thumb just behind the seam on the opposite side of the ball such that if looking from the top down, the hand should form a "C shape" with the horseshoe pointing in towards the palm following the contour of the thumb. The index finger is placed alongside the middle finger, and the other two extraneous fingers are folded in towards the palm with the knuckle of the ring finger touching the leather. Occasionally some pitchers will flare out these two fingers straight and away from the ball to keep them clear of the throwing motion. The curveball and slider share nearly identical grips and throwing motion.

The delivery of a curveball is entirely different from that of most other pitches. The pitcher at the top of the throwing arc will snap the arm and wrist in a downward motion. The ball first leaves contact with the thumb and tumbles over the index finger thus imparting the forward or "top-spin" characteristic of a curveball. The result is the exact opposite pitch of the four-seam fastball's backspin, but with all four seams rotating in the direction of the flight path with forward-spin, with the axis of rotation perpendicular to the intended flight path much like a reel-type mower or a bowling ball.

The amount of break on the ball depends on how hard the pitcher can snap the throw off, or how much forward spin can be put on the ball. The harder the snap, the more the pitch will break. Curveballs primarily break downwards, but can also break toward the pitcher's off hand to varying degrees. Unlike the fastball, the height of the ball's flight path arc does not necessarily need to occur at the pitcher's release point, and often peaks shortly afterwards. Curveballs are thrown with considerably less velocity than fastballs, because of both the unnatural delivery of the ball and the general rule that pitches thrown with less velocity will break more. A typical curveball in the major collegiate level and above will average between 65 and 80 MPH, with the average MLB curve at 77 MPH.

From a hitter's perspective, the curveball will start in one location (usually high or at the top of the strike zone) and then dive rapidly as it approaches the plate. The most effective curveballs will start breaking at the height of the arc of the ball flight, and continue to break more and more rapidly as they approach and cross through the strike zone. A curveball that a pitcher fails to put enough spin on will not break much and is colloquially called a "hanging curve". Hanging curves are usually disastrous for a pitcher because the low velocity, non-breaking pitch is left high in the zone where hitters can wait on it and drive it for power.

The curveball is a popular and effective pitch in professional baseball, but it is not particularly widespread in leagues with players younger than college-level players. This is with regard for the safety of the pitcher - not because of its difficulty - though the pitch is widely considered difficult to learn as it requires some degree of mastery and the ability to pinpoint the thrown ball's location. There is generally greater chance of throwing wild pitches when throwing the curveball.

When thrown correctly, it could have a break from seven to as much as 20 inches in comparison to the same pitcher's fastball.

Safety

Due to the unnatural motion required to throw it, the curveball is considered a more advanced pitch and poses inherent risk of injury to a pitcher’s elbow and shoulder. There has been a controversy, as reported in the New York Times, March 12, 2012, about whether curveballs alone are responsible for injuries in young pitchers or whether it is the number of pitches thrown that are the predisposing factor. In theory, allowing time for the cartilage and tendons of the arm to fully develop would protect against injuries. While acquisition of proper form might be protective, Dr. James Andrews is quoted in the article as stating that in many children, insufficient neuromuscular control, lack of proper mechanics, and fatigue make maintenance of proper form unlikely.

The parts of the arm most commonly injured by the curveball are the ligaments in the elbow, the biceps, and the forearm muscles.

The 12–6 curveball vs. The "slurve"

Curveballs have a variety of trajectories and breaks among pitchers. This chiefly has to do with the arm slot and release point of a given pitcher, which is in turn governed by how comfortable the pitcher is throwing the overhand curveball.

Pitchers who can throw a curveball completely over handed with the arm slot more or less vertical will have a curveball that will break straight downwards. This is called a12–6 curveball as the break of the pitch is on a straight path downwards like the hands of a clock at 12 and 6. The axis of rotation of a 12–6 curve is parallel with the level ground and perpendicular to its flight path.

Pitchers who throw their curveballs with the arm slot at an angle will throw a curveball that breaks down and toward the pitcher's off-hand. In the most extreme cases the curve will break very wide laterally. Because the slider and the curveball share nearly the same grip and have the same unique throwing motions, this curveball breaks much like a slider, and is colloquially termed a "slurve." The axis of rotation on a slurve will still be more or less perpendicular to the flight path of the ball, however it will not be parallel to the ground. With some pitchers, the difference between curveball and other pitches such as slider and slurve, may be difficult to detect or even describe. A less common term for this type of curveball is a 1-7 or 2-8 curve.

Physics of a curveball

Generally the Magnus effect describes the laws of physics that make a curveball curve. A fastball travels through the air with backspin, which creates a higher pressure zone in the air ahead of and under the baseball. The baseball's raised seams augment the ball's ability to develop a boundary layer and therefore a greater differential of pressure between the upper and lower zones. The effect of gravity is partially counteracted as the ball rides on and into increased pressure. Thus the fastball falls less than a ball thrown without spin (neglecting knuckleball effects) during the 60 feet 6 inches it travels to home plate.

On the other hand, a curveball, thrown with topspin, creates a higher pressure zone on top of the ball, which deflects the ball downward in flight. Instead of counteracting gravity, the curveball adds additional downward force, thereby gives the ball an exaggerated drop in flight.

• Outline
  

  SPORTS WORLD

  Baseball

  Baseball is a bat-and-ball game played between two teams of nine players each who take turns batting and fielding. The batting team attempts to score runs by hitting a ball that is thrown by the pitcher with a bat swung by the batter, then running counter-clockwise around a series of four bases: first, second, third, and home plate.

  Rules and gameplay: A game is played between two teams, each comprising nine players, that take turns playing offense (batting and baserunning) and defense (pitching and fielding).

  Baseball field: A baseball field, also called a ball field or a baseball diamond, is the field upon which the game of baseball is played.

  Equipment: A rounded, solid wooden or hollow aluminum bat. Wooden bats are traditionally made from ash wood, though maple and bamboo is also sometimes used.

  Player rosters: Roster, or squad, sizes differ between different leagues and different levels of organized play. Major League Baseball teams maintain 25-player active rosters.

  Non players: In the game of baseball, the official scorer is a person appointed by the league to record the events on the field, and to send the official scoring record of the game back to the league offices.

  Distinctive elements: Baseball has certain attributes that set it apart from the other popular team sports in the countries where it has a following, including American and Canadian football, basketball, ice hockey, and soccer.

  Defensive Play: Baseball is unlike most other competitive sports in that the defense is given control of the ball.

  Offensive Play: Batting is the act of facing the opposing pitcher and trying to produce offense for one's team. A batter or hitter is a person whose turn it is to face the pitcher.

  Batting order (1-9): The batting order or batting lineup is the sequence in which the members of the offense take their turns in batting against the pitcher.

  Strategy and tactics: Many of the pre-game and in-game strategic decisions in baseball revolve around a fundamental fact: in general, right-handed batters tend to be more successful against left-handed pitchers and, to an even greater degree, left-handed batters tend to be more successful against right-handed pitchers.

• Baseball Positions
  

  SPORTS WORLD

  Baseball Positions

  At the beginning of each half-inning, the nine players on the fielding team arrange themselves around the field. One of them, the pitcher, stands on the pitcher's mound.

  Defensive Players

  Pitcher (P): The pitcher is the player who throws the baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk.

  Catcher (C): When a batter takes his/her turn to hit, the catcher crouches behind home plate, in front of the (home) umpire, and receives the ball from the pitcher.

  First Baseman (1B): First base, or 1B, is the first of four stations on a baseball diamond which must be touched in succession by a baserunner in order to score a run for that player's team.

  Second Baseman (2B): The second baseman often possesses quick hands and feet, needs the ability to get rid of the ball quickly, and must be able to make the pivot on a double play.

  Third Baseman (3B): The third baseman requires good reflexes in reacting to batted balls, as he or she is often the closest infielder (roughly 90–120 feet) to the batter.

  Shortstop (SS): The position is mostly filled by defensive specialists, so shortstops are generally relatively poor batters who bat later in the batting order, with some exceptions.

  Left Fielder (LF): Outfielders must cover large distances - speed, instincts, and quickness in reacting to the ball are key. They must be able to catch fly balls above their head and on the run.

  Center Fielder (CF): A center fielder, abbreviated CF, is the outfielder in baseball who plays defense in center field – the baseball fielding position between left field and right field.

  Right Fielder (RF): Right field is the area of the outfield to the right of a person standing at home plate and facing towards the pitcher's mound.

   

  Offensive Players

  Batter: A batter or hitter is a person whose turn it is to face the pitcher. The three main goals of batters are to become a baserunner, drive runners home, or advance runners along the bases for others to drive home.

  Runner: In general, base running is a tactical part of the game with the goal of eventually reaching home to score a run.

  Designated Hitter: The rule allows teams to have one player, known as the designated hitter (abbreviated DH), to bat in place of the pitcher.

  Pinch Hitter: Batters can be substituted at any time while the ball is dead (not in active play); the manager may use any player who has not yet entered the game as a substitute.

  Pinch Runner: The pinch runner may be faster or otherwise more skilled at base-running than the player for whom the pinch runner has been substituted.

  Lead Off: A lead or lead off is the short distance that a player stands away from their current base.

  Lead Off Hitter: Leadoff hitters must possess certain traits to be successful: they must reach base at a proficient on-base percentage rate and be able to steal bases.

  Cleanup Hitter: Cleanup hitters often have the most power on the team and are typically the team's best power hitter; their job is to "clean up the bases", hence the name.

RESOURCES
This article uses material from the Wikipedia articles "Baseball" and "Curveball", which is released under the Creative Commons Attribution-Share-Alike License 3.0.