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July 12: Most inside-the-park home runs in a game: 3 by Tom McCreery (1897)
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Most home runs, season – 29 by Babe Ruth. (1919)
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July 19: Most home runs, season – 30 by Babe Ruth; ended the season with 54. (1920)
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Highest slugging percentage, season – .847 by Ruth. (1920)
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September 27: Most RBI, season – 172 by Lou Gehrig; ended season with 175. (1927)
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September 30: Most home runs, season – 60 by Babe Ruth. (1927)
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September 17: Most RBI, season – 176 by Hack Wilson; ended season with 191. (1930)
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July 10: Most hits in a game by a batter – 9 by Johnny Burnett (1932)
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July 2: Longest hitting streak in a single season – 45 by Joe DiMaggio; extended to 56. (1941)
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July 5: Longest hitting streak spanning one or more seasons – 46 by Joe DiMaggio; extended to 56. (1941)
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October 1: Most home runs, season – 61 by Roger Maris (1961)
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April 8: Most career home runs – 715 by Hank Aaron; ended his career in 1976 with 755. (1974)
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September 8: Most career hits – 4,190 by Pete Rose; ended his career in 1986 with 4,256. (1985)
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August 14: Most home runs by a rookie, season – 39 by Mark McGwire; later extended to 49. (1987)
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May 1: Most career stolen bases – 939 by Rickey Henderson; ended his career in 2003 with 1,406. (1991)
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September 6: Most consecutive games played – 2,131 by Cal Ripken, Jr.; later extended to 2,632 in 1998. (1995)
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September 19: Most teams with which a player has hit 20 home runs in a season – 2 by Mark McGwire (1997)
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June 25: Most home runs in a calendar month – 19 by Sammy Sosa (extended to 20 on June 30). (1998)
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September 8: Most home runs, season – 62 by Mark McGwire; later extended to 70. Sosa also broke the 37-year-old record held by Roger Maris and was briefly the sole record-holder, hitting his 66th home run of the season (which would be his final total) before McGwire did. (1998)
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April 23: Most grand slams hit in one inning – 2 by Fernando Tatís (1999)
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Most grand slams surrendered in one inning – 2 by Chan Ho Park (1999)
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October 4: Most career runs – 2,246 by Rickey Henderson; ended his career in 2003 with 2,295 (2001)
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October 5: Most home runs, season – 71 by Barry Bonds (hit #72 in same game; finished season with 73) (2001)
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Highest slugging percentage, season – .863 by Bonds. (2001)
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April 30: Most franchises against which a pitcher has earned a win: 30 by Al Leiter (2002)
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Highest on-base percentage, season – .582 by Barry Bonds. (2002)
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September 17: Most extra-base hits, season, by a team – 608 by Boston Red Sox (2003)
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July 10: Most intentional walks, season – 68 by Barry Bonds; broke his own record; finished season with 120 (2004)
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October 6: Most hits in one season – 262 by Ichiro Suzuki (2004)
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Highest on-base percentage, season – .609 by Bonds. (2004)
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June 8: Youngest player to reach 400 home run mark – Alex Rodriguez, age 29 years, 316 days (2005)
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April 28: Most consecutive games with a home run by a right-handed hitter – 7 by Kevin Mench (2006)
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April 29: Most home runs in the month of April – 14 by Albert Pujols (2006)
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August 4: Youngest player to reach 500 career home runs – Alex Rodriguez, age 32 years, 8 days (2007)
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August 7: Most home runs, career – 756 by Barry Bonds; later extended to 762 (2007)
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April 2: Most consecutive games without an error for a first baseman – 194 by Kevin Youkilis; later extended to 238 games (2008)
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May 9: Most baserunners picked off, career – 92 Kenny Rogers (since stat was first recorded in 1974) (2008)
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May 16: Most consecutive starts with a no-decision – 9 by Shawn Chacón (2008)
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June 17: Most games caught – 2,227 by Iván Rodríguez; later extended to 2,427 games. (2009)
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August 4: Youngest player to reach 600 career home runs – Alex Rodriguez, age 35 years, 8 days (2010)
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August 2: Most games hitting home runs from both sides of the plate in a career – 12 by Mark Teixeira (2011)
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September 19: Most career saves – 602 by Mariano Rivera; later extended to 652 saves. (2011)
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April 17: Oldest pitcher to win a game – Jamie Moyer, age 49 years, 151 days. Extended record on May 16 (see below). (2012)
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May 16: Oldest player to drive in a run – Moyer, age 49 years, 180 days (2012)
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June 23: Most walk-off home runs – 13 by Jim Thome (since 1900) (2012)
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September 20: Most career grand slams – 24 by Alex Rodriguez; later extended to 25. (2013)
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October 21: Most consecutive postseason games with a home run – 6 by Daniel Murphy (2015)
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September 25: Most home runs by a rookie, season – 50 by Aaron Judge; later extended to 52. (2017)
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September 28: Most home runs by a rookie, season - 53 by Pete Alonso (2019)
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