International competition
National Team tournaments Americas Olympic Qualifying Event: United States Olympics Final Qualifying Tournament: Dominican Republic 2020 Summer Olympics: Japan European Baseball Championship: Netherlands U-23 Baseball World Cup: Venezuela
Club team tournaments 2021 Caribbean Series: Águilas Cibaeñas European Cup: Parma Baseball Club
U.S.A. domestic leagues Major League Baseball
Minor League Baseball Triple-A East: Durham Bulls (Tampa Bay Rays) Triple-A West: Tacoma Rainiers (Seattle Mariners) Double-A Central: Northwest Arkansas Naturals (Kansas City Royals) Double-A Northeast: Akron RubberDucks (Cleveland Indians) Double-A South: Mississippi Braves (Atlanta Braves) High-A Central: Quad Cities River Bandits (Kansas City Royals) High-A East: Bowling Green Hot Rods (Tampa Bay Rays) High-A West: Eugene Emeralds (San Francisco Giants) Low-A East: Charleston RiverDogs (Tampa Bay Rays) Low-A Southeast: Bradenton Marauders (Pittsburgh Pirates) Low-A West: San Jose Giants (San Francisco Giants) Arizona Complex League: No Champion Declared Dominican Summer League: No Champion Declared Florida Complex League: No Champion Declared Fall league Arizona Fall League: Mesa Solar Sox MLB partner leagues American Association of Professional Baseball: Kansas City Monarchs Atlantic League of Professional Baseball: Lexington Legends Frontier League: Schaumburg Boomers Pioneer League: Missoula PaddleHeads Independent leagues Empire Professional Baseball League: Saranac Lake Surge Pecos League: Tucson Saguaros United Shore Professional Baseball League: Utica Unicorns College Baseball 2021 College World Series: Mississippi State NCAA Division II: Wingate University NCAA Division III: Salisbury University NAIA: Georgia Gwinnett College Junior College World Series: Division I: McLennan Community College Division II: Louisiana State University at Eunice Division III: Tyler Junior College Collegiate Summer Baseball Leagues Appalachian League: Greeneville Flyboys Cape Cod League: Brewster Whitecaps MLB Draft League: Trenton Thunder New England Collegiate Baseball League: Danbury Westerners 2021 Little League World Series: Taylor North Little League (Taylor, Michigan)
Other domestic leagues Summer leagues Chinese Professional Baseball LeagueTaiwan Series: CTBC Brothers Dutch League: L&D Amsterdam Finnish League: Tampere Tigers French League: Rouen Baseball 76 German League: Heidenheim Heideköpfe Irish League: Mariners Baseball Italian League: T & A San Marino KBO LeagueKorean Series: KT Wiz Mexican League: Toros de Tijuana Nippon Professional BaseballJapan Series: Tokyo Yakult Swallows Central League: Tokyo Yakult Swallows Pacific League: Orix Buffaloes Spanish League: Tenerife Marlins Swedish League: Leksand Lumberjacks
Winter leagues Australian Baseball League: Melbourne Aces Colombian League: Caimanes de Barranquilla Cuban National Series: Alazanes de Granma Dominican League: Águilas Cibaeñas Mexican Pacific League: Tomateros de Culiacán Nicaraguan League: Gigantes de Rivas Panamanian League: Cancelled Puerto Rican League: Criollos de Caguas Venezuelan League: Caribes de Anzoátegui
Awards and honors Major League Baseball Baseball Hall of Fame honors
Events
January January 26: For the first time since 2013, the Baseball Writers' Association of America fails to select a player for induction into the Hall of Fame. Curt Schilling, Barry Bonds and Roger Clemens, all in their ninth year on the ballot, receive 71.1, 61.8 and 61.6 percent of the ballot respectively. Scott Rolen, in his fourth year on the ballot, is the only other player named on half of the ballots at 52.9%.
February February 12: Major League Baseball announced its new league structure for minor league play, a structure that excluded and effectively disbanded the historic leagues between class A and AAA. February 25: Spring Training Begins for all 30 teams including Pitchers and catchers
March March 17: St Patricks Day
April April 1: 2021 Major League Baseball season begins April 9: After 52 seasons and 8,205 games, the San Diego Padres record their first no-hitter with Joe Musgrove performing the deed, blanking the Texas Rangers 3–0 at Globe Life Field. He throws 77 of 112 pitches for strikes and strikes out 10 batters; a fourth-inning hit by pitch to Joey Gallo is the only blemish in an otherwise perfect game. The Padres had been the last of the 30 Major League teams to record a no-hitter. Previously, they had had four no-hit bids broken up in the ninth, with Steve Arlin having come the closest, losing his bid on July 18, with two out and one strike to go. Alessandro Ercolani signs an amateur free agent contract with the Pittsburgh Pirates, becoming the first player born in San Marino and the first player developed in San Marino to sign a professional baseball contract outside of the Italian Baseball League. April 14: At Guaranteed Rate Field, Carlos Rodón of the Chicago White Sox no-hits the Cleveland Indians 8–0, the 20th no-hitter in franchise history. After retiring the first 25 batters, he loses his bid for a perfect game on a hit by pitch to Roberto Pérez. Rodón, who strikes out seven and throws 75 of 114 pitches for strikes, then retires the next two batters. Rodón becomes the fourth pitcher to record a no-hitter after losing a perfect game bid in the ninth, joining Jack Kralick in , Milt Pappas in and Max Scherzer in the first of his two no-hitters (the latter's bid was also broken up on a hit by pitch, with two out). The no-hitter also ties Eddie Cicotte's 104-year record for the earliest no-hitter calendar-wise by a White Sox pitcher. April 15: Jackie Robinson Day April 18: At Great American Ball Park, Shane Bieber of the Cleveland Indians becomes the first pitcher to strike out at least 10 batters in his first four starts of a season, dating back to when the mound was moved to its current distance in . He records 13 strikeouts in eight innings in the Indians' 6–3 victory over the Cincinnati Reds. With 48 strikeouts in these four starts, Bieber also ties Nolan Ryan's 43-year record for most strikeouts in his first four starts of a season. April 23: At Citi Field, Jacob deGrom of the New York Mets shuts out the Washington Nationals 6–0, striking out 15 batters along the way. With 50 strikeouts on season, he breaks the record of 48 for most by a pitcher in his first four starts of a season, Nolan Ryan having set the record in and Shane Bieber having tied it only five days earlier. deGrom also becomes the third pitcher, after Pedro Martínez in and Gerrit Cole in , to strike out at least 14 batters in three consecutive starts. At Dodger Stadium, Fernando Tatís Jr. hits two home runs off Clayton Kershaw, in the third and fifth innings, to help the San Diego Padres defeat the Los Angeles Dodgers 6–1. Tatís' performance comes 22 years to the day that his father, Fernando Sr., while playing for the St. Louis Cardinals, became the only player, to date, to hit two grand slams in the same inning of a Major League game, that feat also having occurred at Dodger Stadium. Like the son's first home run, the father's two had also come in the third inning; the Cardinals defeated the Dodgers 12–5. April 24: For the second consecutive game, Fernando Tatís Jr. records a two-home run game at Dodger Stadium, this time with both home runs coming off defending National League Cy Young Award winner Trevor Bauer in the San Diego Padres' 5–4 loss to the Los Angeles Dodgers. According to STATS, Tatís, having hit two home runs off three-time Cy Young winner Clayton Kershaw the day before, becomes the first player to hit multiple home runs against former Cy Young Award winners in consecutive games, as well as the first visiting player to record consecutive multi-home run games at Dodger Stadium since Barry Bonds in . April 25: Madison Bumgarner of the Arizona Diamondbacks no-hits the Atlanta Braves 7–0 at Truist Park in the second game of a doubleheader. However, Bumgarner's feat is an unofficial no-hitter, as for the 2021 season, both games of a doubleheader last only seven innings. April 26: At Globe Life Field, Justin Upton and Albert Pujols hit back-to-back home runs, the 312th and 667th respectively of their careers, in the third inning of the Los Angeles Angels' 9–4 victory over the Texas Rangers. The 979 homers are the third-most combined between teammates hitting back-to-back homers in the same game. The top two marks are by New York Yankee teammates: 1,099 between Alex Rodriguez (694) and Carlos Beltrán (405) on June 3, , and 1,005 between Babe Ruth (694) and Lou Gehrig (311) on May 28, . April 30: Hall-of-Famer Roberto Alomar is fired by the Toronto Blue Jays and placed on Major League Baseball's ineligible list following an independent investigation into allegations of sexual misconduct from . Alomar will remain enshrined in the Hall of Fame; however, the Blue Jays announce that they will sever all ties with him, removing his retired number 12 jersey from the Rogers Centre and his name from the stadium's "Level of Excellence", as well as taking down his Hall of Fame banner.
May May 4: Minor League season begins May 5: At T-Mobile Park, John Means of the Baltimore Orioles no-hits the Seattle Mariners 6–0. He strikes out 12 and faces the minimum 27 batters, Sam Haggerty's reaching base on a dropped third strike in the third inning being the only blemish in an otherwise perfect game; Haggerty is subsequently caught stealing. The no-hitter is the Orioles' first since Bob Milacki, Mike Flanagan, Mark Williamson and Gregg Olson combined for one on July 13, , and their first solo no-hitter since Jim Palmer's on August 13, . May 7: At Progressive Field, Wade Miley of the Cincinnati Reds no-hits the Cleveland Indians 3–0. He strikes out eight and throws 72 of 114 pitches for strikes. The only blemishes are in the sixth inning: a double error by Nick Senzel with Amed Rosario batting, first on a fielding error, then on a throwing error that advances Rosario to second base, then a walk to César Hernández. The no-hitter is the 17th in Reds history, the most recent having been Homer Bailey's second on July 2, . May 13: In his Milwaukee Brewers' 2–0 loss to the St. Louis Cardinals at American Family Field, Corbin Burnes sets a Major League record for most strikeouts without a base on balls. Entering the game with 49 strikeouts, he strikes out nine before walking Tommy Edman in the fifth inning, the first walk Burnes issues this season. The 58 strikeouts without a walk is the most at any stretch of the season, Curt Schilling having set the old record of 56 in and Gerrit Cole having tied it one day earlier. Burnes also sets a record for strikeouts without a walk to begin a season, Kenley Jansen having set the old record of 51 in May 18: At T-Mobile Park, Spencer Turnbull of the Detroit Tigers no-hits the Seattle Mariners 5–0. He strikes out nine batters and throws 77 of 117 pitches for strikes in throwing the eighth no-hitter in Tiger history, and the first since the second of Justin Verlander's three no-hitters on May 7, . The no-hitter is the fifth in the Major Leagues this season, marking the first time since that five no-hitters had been pitched in one season as of May 18. With John Means of the Baltimore Orioles having no-hit the Mariners on May 5, the Mariners become the first team since the Los Angeles Dodgers in August to be no-hit twice in the same month.