What is curveball?

Curveball

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.

Read more about Curveball.

Some articles on curveball:

Curveball (informant) - Claims and Background
... Curveball's story began in November 1999 when Alwan, then in his early 30's, arrived at Munich's Franz Josef Strauss Airport with a tourist visa ... Although the Americans did not have "direct access" to Curveball, information collected by the BND debriefing team was later passed on in part to the Defense Intelligence Agency in ... to keep supplying information to German intelligence, Curveball had been granted asylum, as he had applied earlier in 1999 and failed ...
Paul Maholm - Pitching Style
... four-seam fastball (87–90), changeup (80–83), cut fastball (83–86), slider (79–82), and curveball (70–75) ... He throws his curveball to batters from both sides of the plate ... In 2013, he added a slow curveball that ranges from 70 MPH to 62 MPH, that at times dips in the 50's ...
Gio Gonzalez - Scouting
... a four-seam fastball at 92–95 mph, a two-seam fastball at 91–95, a curveball at 78–82, and a changeup at 85–87 that is used against right-handed hitters ... His curveball is used frequently when he is ahead in the count, especially against left-handers ... above-average whiff rates, with the curveball leading at 36% and the changeup close behind at 35% ...
Curveball - History
... Baseball lore has it that the curveball was invented in the early 1870s by Fred Goldsmith or Candy Cummings (it is debatable) ... An early demonstration of the "skewball" or curveball occurred at the Capitoline Grounds in Brooklyn in August, 1870 by Fred Goldsmith ... It told of how a boy pitcher mastered the curveball to defeat the opposing batters ...
Slider
... spinner) is a pitch that breaks laterally and down, with a speed between that of a curveball and that of a fastball ... The break on the pitch is shorter than that of a curveball ... release technique of a slider is between a curveball and a fastball ...