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Armando Galarraga's near-perfect game
Armando Galarraga's near-perfect game: June 2, 2010 Tigers-Indians start in which umpire Jim Joyce's blown safe call at first base cost Galarraga the 21st MLB perfect game; officially a one-hit shutout.
Aroldis Chapman
Aroldis Chapman is a Cuban-born Major League Baseball left-handed relief pitcher for the Boston Red Sox, known for the fastest recorded pitch in MLB history.
Art Howe
Art Howe (born 1946), American MLB infielder and manager of the Astros, Athletics, and Mets (1989-2004); led the 2002 'Moneyball' A's to 103 wins and a 20-game streak; 1,129-1,137 career record.
Arte Moreno
Arte Moreno (Arturo R. Moreno), Tucson-born billboard magnate who sold Outdoor Systems for $8.3 billion in 1999 and became the first Hispanic controlling owner of an MLB team, buying the Angels from Disney in 2003 for about $183.5 million, renaming them, and selling to Stan Kroenke for a reported record $4 billion.
Asian Baseball Championship
The Asian Baseball Championship is Asia's premier baseball tournament for national teams, organized by the Baseball Federation of Asia, first held in Manila in 1954, and serving as Olympic qualification.
Astrodome
Astrodome (Harris County Domed Stadium), Houston, Texas: world's first air-conditioned enclosed domed stadium, opened April 1965, nicknamed the Eighth Wonder of the World; birthplace of AstroTurf, vacant since 2009.
Athletes Unlimited Softball League
Athletes Unlimited Softball League (AUSL), also AUSL All-Star Cup for its individual event, is a US professional women's softball league launched June 2025, MLB-backed, six city-based teams since 2026, Utah Talons champions, commissioner Kim Ng.
Athletics (baseball)
Athletics (baseball): the physical characteristics, in-game demands, training, and injuries of baseball players, documented by MLB's HITS database; pitchers suffer 39% of injuries and UCL tears dominate surgery.
Atlanta Braves
Atlanta Braves, MLB National League East franchise; began as Boston Red Stockings 1871, moved to Milwaukee 1953 and Atlanta 1966; only MLB team with World Series titles in three cities (1914, 1957, 1995, 2021).
Atlanta–Fulton County Stadium
Atlanta–Fulton County Stadium (originally Atlanta Stadium) was Atlanta's 1965 multipurpose stadium, home of the Braves (1966–1996) and Falcons (1966–1991), site of Hank Aaron's 715th home run and 1996 Olympic baseball, imploded in 1997.
Atlantic League of Professional Baseball
Atlantic League of Professional Baseball (ALPB), independent pro baseball league founded 1998 by Frank Boulton; MLB's first Professional Partner League since 2019; 10 teams, 126-game schedule, rule-testing lab, Boulton Trophy.
Aubrey Huff
Aubrey Huff, born 1976, American MLB first baseman/outfielder 2000–2012 with Rays, Astros, Orioles, Tigers, Giants; .278, 242 HR; 2008 AL Silver Slugger; 2010 and 2012 World Series champion.
Augie Garrido
Augie Garrido (1939-2018), American college baseball coach; won five College World Series titles with Cal State Fullerton and Texas; retired in 2016 with an NCAA-record 1,975 wins.
Augusta GreenJackets
Augusta GreenJackets: Single-A Carolina League affiliate of the Atlanta Braves, based in North Augusta, South Carolina, at SRP Park since 2018; founded 1988 as the Augusta Pirates, with league titles in 1989, 1995, 1999, and 2008.
Austin Barnes
Austin Barnes (born 1989) is an American MLB catcher, drafted by the Marlins in 2011, who spent 2015-2025 as the Dodgers' defense-first backup catcher, won World Series titles in 2020 and 2024, and was known for elite pitch framing.
Austin Gomber
Austin Zachary Gomber, left-handed MLB pitcher (debut 2018) for the Cardinals and Rockies; acquired in the Nolan Arenado trade; 35-47, 5.08 ERA career; later minor league deals with Rangers, Braves, Tigers.
Austin Riley
Austin Riley (Michael Austin Riley, born 1997) is an Atlanta Braves third baseman, drafted 41st overall in 2015, 2021 World Series champion, two-time All-Star, and holder of a 10-year, $212 million contract through 2032.
Australian Baseball League
The Australian Baseball League (ABL) is Australia's professional baseball league, founded in 2010 as a Baseball Australia-MLB joint venture, playing November to February for the Claxton Shield with four teams since 2025-26.
Ayumi Karino
Ayumi Karino (狩野亜由美, born 1984, Amagasaki, Hyogo) is a Japanese softball outfielder for Toyota Shokki who won gold with Japan at the 2008 Beijing Olympics and Asian Games golds at Doha 2006 and Guangzhou 2010.
Babe Ruth
Babe Ruth (George Herman Ruth Jr., 1895–1948), the Sultan of Swat and Bambino, American MLB slugger and pitcher; 714 home runs, 60 in 1927, inaugural 1936 Hall of Fame class, Yankees number 3 retired.
Bad News Bears
Bad News Bears is a 2005 American sports comedy directed by Richard Linklater, starring Billy Bob Thornton as a washed-up coach of a losing Little League team.
Baker Bowl
Baker Bowl (National League Park), Philadelphia ballpark at Broad Street and Lehigh Avenue, Phillies home 1887-1938; rebuilt 1895 with cantilever steel-and-brick design, 1903 collapse killed 12, short 281-foot right field, Babe Ruth's final at-bat.
Balk
Balk: an illegal, deceptive pitching motion in baseball with runners on base; runners advance one base. 13 listed acts, 1898 origin, 1988's 924-balk season, and MLB's 2023 two-disengagement limit.
Baltimore Orioles
Baltimore Orioles, American League East MLB team at Oriole Park at Camden Yards since 1992; moved from St. Louis as the Browns in 1954; three World Series titles (1966, 1970, 1983), Earl Weaver era, Ripken's streak, Rubenstein ownership.
Baltimore Orioles (1882–1899)
Baltimore Orioles (1882–1899), original NL/AA franchise, won three straight NL pennants 1894–1896 under Ned Hanlon with inside baseball; stars sold to Brooklyn, folded 1899; 1901 AL successor became the Yankees.
Banana Ball
Banana Ball, also called Banana Ball rules of the Savannah Bananas, is an 11-rule fast baseball variant with inning points, a two-hour limit, fan foul-ball outs, and a six-team BBCL touring league.
Barry Bonds
Barry Bonds (Barry Lamar Bonds, born 1964) is MLB's all-time leader in home runs (762) and walks (2,558), a seven-time NL MVP with Pittsburgh and San Francisco, still outside the Hall of Fame.
Barry Larkin
Barry Louis Larkin, Cincinnati Reds Hall of Fame shortstop (1986-2004), 1995 NL MVP, first shortstop with a 30-homer/30-steal season, 1990 World Series champion, elected to Cooperstown in 2012.
Barry Zito
Barry Zito, MLB left-handed starting pitcher; 2002 AL Cy Young winner with Oakland Athletics, record $126M San Francisco Giants contract, 2012 World Series champion, later Nashville songwriter.
Bartolo Colón
Bartolo Colón (Big Sexy), Dominican MLB pitcher (1997-2018), 247-188, 4.12 ERA, 2,535 strikeouts, 2005 AL Cy Young with the Angels; career wins leader among Latin American-born pitchers; 2012 testosterone suspension; 2024 Hall ballot drew five votes.