Editing Fastball (section)

==Types of fastballs==
[[File:Fastball Three.gif|alt=fastballs.gif|thumb|320x320px|Types of fastballs as thrown by a right handed pitcher and viewed from the catcher's perspective: [[Four-seam fastball|four-seam]], [[Sinker (pitch)|sinker]], and [[Cut fastball|cutter]]]]
Many varieties or 'shapes' of fastballs have been described throughout baseball history, including four-seam fastballs, rising fastballs, two-seam fastballs, sinkers, running fastballs, cut fastballs, and split finger fastballs. However, [[Major League Baseball|MLB]] currently recognizes three distinct types of fastballs, each with substantial variety in terms of movement, consolidating the numerous antiquated descriptors into three groups: [[Four-seam fastball|four-seam fastballs]], [[Sinker (pitch)|sinkers]] (two-seam fastballs), and [[Cut fastball|cutters]] (cut fastballs). Despite its name, the [[split-finger fastball]] or 'splitter' is not considered to be a type of fastball and is known as an [[off-speed pitch]].<ref>{{Cite web |title=Glossary |url=https://www.mlb.com/glossary |access-date=2024-07-06 |website=MLB.com |language=en}}</ref>

===Four-seam fastball===
{{main|Four-seam fastball}}
{{tone|section|date=June 2017}}
[[File:Three fastballs.gif|thumb|320x320px|Spin of 3 four-seam-fastballs thrown by [[Paul Skenes]], [[Bailey Ober]], and [[James Karinchak]] respectively, from the catcher's perspective.]]
The '''four-seam fastball''' is the most common variant of the fastball. The pitch is used often by the [[pitcher]] to get ahead in the count or when he needs to throw a [[strike (baseball)|strike]]. This type of fastball is intended to have minimal lateral movement, relying more on its velocity and vertical 'rising' movement. It is typically the fastest pitch a pitcher throws, with recorded top speeds above {{cvt|100|mph|m/s}}. Two general methods are used to throw a four-seam fastball. The first and most traditional way is to find the horseshoe seam area, or the area where the seams are the furthest apart. Keeping those seams parallel to the body, the pitcher places his index and middle fingers perpendicular to them with the pads on the furthest seam from him. The thumb then rests underneath the ball about in the middle of the two fingers. With this grip, the thumb will generally have no seam on which to rest.[[File:Four-Seem Fastball.gif|thumb|200px|An animated diagram of a four-seam fastball]]

The four-seam fastball is widely regarded as the main key to advancing to the next level of play. One of a baseball scout's main criteria when scouting a prospect is how fast he throws a four-seam fastball. 

===Sinker (two-seam fastball) ===
{{main|Two-seam fastball|Sinker (baseball)}}
The '''sinker''', synonymous with the '''two-seam fastball, two-seamer''', '''tailing fastball''', '''or running fastball''' is a type of fastball thrown with a seam orientation that induces more downward or arm-side horizontal movement compared to four-seam fastballs or cutters. Historically, distinctions have been made between these terms, but today, they are all recognized by MLB as variations of the same pitch. Differences in arm slot, spin, and velocity cause some sinkers to exhibit more vertical 'drop' or 'sink', while others 'run' or move more horizontally toward the pitcher's arm side. The unique running and sinking movement profile of the sinker makes it more likely to induce ground balls than other pitches as it sinks under the plane of the batter's swing. Not all fastballs exhibiting sinking or running movement are necessarily sinkers; four-seam fastballs thrown from a low arm slot can also exhibit sinking and running movement due to the horizontal spin axis imparted by a low or sidearm release point.<ref>{{Cite web |title=Sinker (SI) {{!}} Glossary |url=https://www.mlb.com/glossary/pitch-types/sinker |access-date=2024-07-07 |website=MLB.com |language=en}}</ref>
[[File:Sinkers three.gif|alt=sinker.gif|thumb|320x320px|Spin of 3 sinkers thrown by [[Yennier Canó]], [[Clay Holmes]], and [[Sonny Gray]] respectively, from the catcher's perspective.]]
To throw a sinker, the pitcher typically grips the ball as they would a four-seam, but with their index and middle finger parallel to the seams instead of perpendicular to them. This causes the ball to spin with two seams crossing the plane of spin instead of four.<ref>{{Cite web |last=Blewett |first=Dan |date=2022-03-28 |title=How to Throw a Sinker: The Definitive Guide in 2021 – Grips, Drills & More |url=https://danblewett.com/throw-sinker-right-way/ |access-date=2024-07-07 |language=en-US}}</ref>

Throughout much of baseball history, the reasons why a two-seam grip resulted in different ball movement compared to a four-seam fastball weren't fully understood. While it was recognized that a reduced spin rate or altered spin axis could create the distinct movement profile of the sinker, it is now understood that the distinctive movement profile of sinkers is primarily due to the [[seam-shifted wake]] (SSW) phenomenon.<ref name=":0">{{Cite web |last=Baseball |first=Driveline |date=2020-11-02 |title=An Introduction to Seam-Shifted Wakes and their Effect on Sinkers |url=https://www.drivelinebaseball.com/2020/11/more-than-what-it-seams-an-introduction-to-seam-shifted-wakes-and-their-effect-on-sinkers/ |access-date=2024-07-07 |website=Driveline Baseball |language=en-US}}</ref>

When a sinker is thrown with a moderate degree of gyro spin and properly oriented seams, the rotating seams around one pole of the baseball create a greater disturbance in the air compared to the seamless area around the other pole. This uneven drag force induces a force perpendicular to the spin direction, typically resulting in more horizontal run, vertical drop, and generally more unpredictable movement than sinkers with less substantial SSW effects. While all pitches experience SSW effects to some degree, sinkers with pronounced seam-shifted movement are understood to be particularly effective pitches, resulting in better outcomes like increased ground ball rates.<ref name=":0" />

The sinker has been a staple for many notable pitchers, often referred to as 'sinkerballers', such as: 

* [[Greg Maddux]], widely regarded as among the finest starting pitchers of all time, pitched heavily off his sinker. He relied on its substantial movement, his precise control, and its above average low 90s velocity to generate ground balls as a young pitcher. Towards the end of his career, his velocity declined into the mid 80s, but his excellent sinker helped him remain effective.<ref>{{Cite web |last=Thornley |first=Stew |title=Greg Maddux |url=https://sabr.org/bioproj/person/greg-maddux/}}</ref>
* [[Brandon Webb]], one of the most highly regarded pitchers of the 2000s before injuries forced his early retirement, was known for having one of the best sinkers in the league. He relied on this pitch to earn a [[Cy Young Award]] and two runner-up finishes from 2006 to 2008.<ref>{{Cite web |date=2023-01-21 |title=Arizona Diamondbacks: The brief and brilliant career of Brandon Webb |url=https://calltothepen.com/2023/01/21/arizona-diamondbacks-brief-brilliant-career-brandon-webb/ |access-date=2024-07-07 |website=Call To The Pen |language=en-US}}</ref>
* [[Zack Britton]], one of the most successful relievers of the 2010s, threw a mid to high 90s sinker more than 90% of the time at his peak. His sinker, now known to have benefitted from substantial seam-shifted wake (SSW) effects, consistently helped him lead the league in ground ball rates.<ref>{{Cite web |title=Zack Britton Stats: Statcast, Visuals & Advanced Metrics |url=https://baseballsavant.mlb.com/savant-player/zack-britton-502154?stats=statcast-r-pitching-mlb |access-date=2024-07-07 |website=baseballsavant.com |language=en-US}}</ref>

===Cutter (cut fastball)===
{{main|Cutter (baseball)}}
[[File:Cut Fastball.gif|thumb|200px|An animated diagram of a cutter]]The '''cutter''' or '''cut fastball''', is a pitch that blurs the lines between a four-seam fastball and a [[Slider (baseball)|slider]]. The pitcher typically shifts their grip on a four-seam fastball to the side of the ball, and slightly [[Anatomical terms of motion|supinates]] their wrist to convert some backspin into gyroscopic spin. This alters the movement of the fastball in several ways.
[[File:Three cutters.gif|alt=cutters.gif|thumb|320x320px|Spin of 3 cutters thrown by [[Louie Varland]], [[Emmanuel Clase]], and [[Kenley Jansen]] respectively, from the catcher's perspective.]]
* Reduces the velocity of the pitch, typically by {{cvt|2|-|8|mph|m/s}} compared to the pitchers four-seam velocity, depending on the degree of wrist supination and biomechanical factors.
* Shifts the spin axis of the ball either reducing arm side movement or adding glove side movement. 
* Increases gyroscopic spin typically leading to less induced vertical movement and causing the pitch to drop more rapidly than a four-seam fastball.
* Altered seam orientation combining with gyroscopic spin increases [[seam-shifted wake]] effects inducing cutting movement to the pitch.
* Many pitchers are able to spin cutters at a higher rate than their four-seam fastball. In MLB in 2024, cutters averaged nearly 2400 RPM compared to around 2300 RPM for the average four-seam fastball.<ref>{{Cite web |title=Statcast Search: 2024 Cutter Characteristics |url=https://baseballsavant.mlb.com/statcast_search?hfPT=FC%7C&hfAB=&hfGT=R%7C&hfPR=&hfZ=&hfStadium=&hfBBL=&hfNewZones=&hfPull=&hfC=&hfSea=2024%7C&hfSit=&player_type=pitcher&hfOuts=&hfOpponent=&pitcher_throws=&batter_stands=&hfSA=&game_date_gt=&game_date_lt=&hfMo=&hfTeam=&home_road=&hfRO=&position=&hfInfield=&hfOutfield=&hfInn=&hfBBT=&hfFlag=&metric_1=&group_by=league-year&min_pitches=0&min_results=0&min_pas=0&sort_col=pitches&player_event_sort=api_p_release_speed&sort_order=desc&chk_stats_api_break_z_with_gravity=on&chk_stats_api_break_x_arm=on&chk_stats_api_break_z_induced=on&chk_stats_velocity=on&chk_stats_spin_rate=on#results}}</ref>

Combined, these effects typically create a pitch slower than a pitcher's four-seam, that drops faster with either sharp glove-side 'cutting' movement or minimal arm-side movement.

Though the cutter is less common in [[Major League Baseball|MLB]] than the [[Four-seam fastball|four-seam]] and the [[Sinker (pitch)|sinker]], there have been many notable practitioners such as: 

* [[Mariano Rivera]], widely regarded as the greatest [[relief pitcher]] in baseball history, relied heavily on a low to mid-90s cutter, at times throwing it almost exclusively. This pitch became notorious for inducing soft contact by cutting in on the hands of left-handed hitters.
* [[Kenley Jansen]], one of the most consistent and decorated relievers of the 2010s, has consistently thrown a low to mid-90s cutter throughout his career. The pitch's heavy [[seam-shifted wake]] induced cut has led to elite whiff rates, consistently in excess of 30%, against right-handed hitters.<ref>{{Cite web |title=Kenley Jansen Stats: Statcast, Visuals & Advanced Metrics |url=https://baseballsavant.mlb.com/savant-player/kenley-jansen-445276?stats=statcast-r-pitching-mlb |access-date=2024-07-07 |website=baseballsavant.com |language=en-US}}</ref>
* [[Emmanuel Clase]] relies heavily on his hard cutter. Consistently averaging around {{cvt|100|mph|m/s}} and reaching as high as {{cvt|102.8|mph|m/s}}, the pitch has produced extremely high ground ball rates throughout his career.<ref>{{Cite web |title=Statcast Search: Emmanuel Clase Peak Velocity |url=https://baseballsavant.mlb.com/statcast_search?hfPT=FF%7CFC%7C&hfAB=&hfGT=R%7C&hfPR=&hfZ=&hfStadium=&hfBBL=&hfNewZones=&hfPull=&hfC=&hfSea=2024%7C2023%7C2022%7C2021%7C2020%7C2019%7C2018%7C2017%7C2016%7C2015%7C&hfSit=&player_type=pitcher&hfOuts=&hfOpponent=&pitcher_throws=&batter_stands=&hfSA=&game_date_gt=&game_date_lt=&hfMo=&hfTeam=&home_road=&hfRO=&position=&hfInfield=&hfOutfield=&hfInn=&hfBBT=&hfFlag=&pitchers_lookup%5B%5D=661403&metric_1=api_p_release_speed&metric_1_gt=102&metric_1_lt=&group_by=name&min_pitches=0&min_results=0&min_pas=0&sort_col=pitches&player_event_sort=api_p_release_speed&sort_order=desc#results |access-date=2024-07-07 |website=baseballsavant.com |language=en-US}}</ref><ref>{{Cite web |title=Emmanuel Clase Stats: Statcast, Visuals & Advanced Metrics |url=https://baseballsavant.mlb.com/savant-player/emmanuel-clase-661403?stats=statcast-r-pitching-mlb |access-date=2024-07-07 |website=baseballsavant.com |language=en-US}}</ref>