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check swing challenge wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 history 2 mechanics 3 impact 4 references toggle the table of contents check swing challenge add languages add links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia baseball umpiring assistance the check swing challenge system is a system used in baseball to automate the determination of whether a batter fully swung their bat at a pitch or instead checked their swing it was first used in the arizona fall league a u s minor league in 2024 and has been introduced to other minor leagues since then history edit in baseball umpires determine whether a batter swung at a pitch in the official rules of major league baseball mlb no definitions exist for swing or checked swing an umpire s judgment determines whether a batter struck at a pitch if the home plate umpire adjudges that a batter did not strike at a pitch outside the strike zone they call the pitch a ball and the catcher or defensive manager may ask for an appeal to the first base or third base umpire instant replay is used for television broadcasts but cannot be used to challenge a check swing ruling 1 beginning in 2024 the arizona fall league afl began a proof of concept test of the check swing challenge system using the same hawk eye technology that is used by the afl for the automated ball strike system abs the initial test was at salt river fields at talking stick home of the salt river rafters an afl team which includes players from the rosters of five mlb clubs 1 the system began to be used by the florida state league fsl a single a league in 2025 2 3 4 and by the pacific coast league pcl a triple a league in 2026 5 6 rob manfred the commissioner of mlb said that he was waiting to test the check swing challenge system in spring training until after clubs have become accustomed to the abs system which was tested in spring training in 2025 and later introduced to the regular season in 2026 7 mechanics edit as with abs the check swing challenge system operates on a challenge basis umpires make an initial call on the field which may be changed on appeal and the umpire s call may then be challenged by a pitcher hitter or catcher as defined by the check swing challenge system a check swing is a swing in which the bat stays within a 45 degree angle from home plate the same angle as the foul lines 1 in 2026 at the same time as triple a baseball introduced the automated check swing challenge system in the pcl umpires in the international league another triple a league were instructed to use the 45 degree threshold for their own check swing calls creating a control group for the experiment with automation 8 in the afl each team receives two challenges if a team has used both of these challenges before the ninth inning it receives an additional challenge in the ninth 1 in the fsl each team receives one challenge and retains the challenge if it is successful in getting a call overturned 2 in the pcl each team starts with two challenges and may use a challenge on either a ball strike call or a swing no swing call but not both on the same pitch 5 impact edit the check swing challenge system is expected to codify for the first time in mlb s history what defines a swing umpires in the distant past had ruled almost any incomplete swing to be a checked swing whereas by 2025 mlb said that umpires called swings and no swings equally at 18 degrees 4 according to mlb the system resulted in a 3 reduction in strikeouts in the fsl leading to more balls in play 5 references edit 1 2 3 4 dykstra sam 23 october 2024 check swing challenge system being tested in arizona fall league mlb com retrieved 2 april 2026 1 2 dykstra sam 20 may 2025 check swing challenge system comes to florida state league mlb com retrieved 2 april 2026 mlb to use hawk eye for checked swing challenges in minors espn com 19 may 2025 retrieved 2 april 2026 1 2 diamond jared 19 may 2025 baseball seeks an answer to a 150 year old question what is a swing the wall street journal retrieved 2 april 2026 1 2 3 greenspan jared 17 march 2026 here are the new rules coming to the minors this season mlb com retrieved 2 april 2026 williams carter 18 march 2026 mlb to test another challenge system at salt lake bees games this season ksl retrieved 2 april 2026 drellich evan 5 june 2025 manfred mlb will propose automated ball strike challenge system for 2026 the new york times retrieved 2 april 2026 franco anthony 16 march 2026 mlb to test check swing rule in triple a mlb trade rumors retrieved 2 april 2026 v t e baseball and softball concepts outline glossary baseball rules cheating comparison of baseball and softball fastpitch softball 16 inch softball ejections ground rules infield fly rule in flight interference pitch clock protested game strike zone suspended game unwritten rules ballpark field backstop baseball diamond batter s box batter s eye bullpen dugout foul pole foul territory infield on deck circle outfield warning track equipment ball baseball rubbing mud bat batting cage batting glove batting helmet cap doughnut glove defense pitching machine protective cup shin guard stirrups uniform uniform number game process batting order challenges ball strike check swing innings extra innings out positions run pace of play batting at bat baltimore chop bat flip batted ball batting count batting out of order bunt sacrifice bunt squeeze play charging the mound checked swing cleanup hitter contact hitter designated hitter double double switch foul ball foul tip golden sombrero ground rule double hat trick hit hit and run hit by pitch hitting for the cycle home run grand slam inside the park walk off moonshot chinese infield hit leadoff hitter lefty righty switch line drive mendoza line on deck pinch hitter plate appearance platoon system power hitter pull hitter sacrifice fly single strikeout strike zone sweet spot switch hitter triple walk pitching softball balk beanball breaking ball brushback pitch changeup vulcan changeup curveball eephus emery ball fastball two seam four seam cutter sinker split finger full count immaculate inning inside pitching intentional balk intentional walk knuckleball maddux no hitter perfect game pickoff pitch count pitching by position players pitching position pitchout quick pitch screwball shutout slider spitball strikeout strike zone striking out the side switch pitcher time of pitch wild pitch base running automatic runner balk bases loaded caught stealing hit and run lead off left on base obstruction pinch runner rundown safe scoring position slide small ball squeeze play stolen base tag up tie goes to the runner fielding positioning appeal play assist blocking the plate catch caught stealing covering a base defensive indifference double play error fielder s choice fifth infielder force play fourth out hidden ball trick in between hop infield fly rule infield shift interference neighborhood play passed ball pickoff putout rundown tag out triple play unassisted uncaught third strike wall climb wheel play related baseball card baseball statistics bench jockey bench clearing brawl dead ball doubleheader jargon injured list list of baseball films night game old timers day pepper scorekeeping series seventh inning stretch shagging sign stealing slump streak losing winning variations of baseball vintage base ball category portal wikiproject v t e sports officiating technology association football football video support goal line technology goalref semi automated offside technology video assistant referee vieww cricket decision review system hot spot cricket snickometer tennis cyclops computer system electronic line judge baseball automated ball strike system check swing challenge curling eye on the hog combat sports automated boxing scoring system timing and finish systems aquatic timing system fully automatic time photo finish multi sport systems hawk eye instant replay retrieved from https en wikipedia org w index php title check_swing_challenge oldid 1375934997 categories baseball terminology major league baseball sports officiating technology hidden categories articles with short description short description matches wikidata this page was last edited on 21 september 2026 at 00 15 utc page was rendered with parsoid text is available under the creative commons 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