The following is a list of records for a game, season, or career that were broken in each Major League Baseball season by players, teams, or others. This does not include dates when additional stats were recorded by the same player above one's own record set (unless broken by someone else in between) or records by a team that do not lead the majors. Some of the records were subsequently broken by others:

1897

*July 12: Most inside-the-park home runs in a game: 3 by Tom McCreery

1919

* Most home runs, season – 29 by Babe Ruth.

1920

*July 19: Most home runs, season – 30 by Babe Ruth; ended the season with 54. * Highest slugging percentage, season – .847 by Ruth.

1921

*July 18: Most career home runs – 139 by Babe Ruth; ended his career in 1935 with 714. **Ruth's passing of Roger Connor for the career home-run record was not recognized at the time. Connor's career total of 138 was not accurately documented until the 1970s; at one time, he was thought to have hit only 131. *September 15: Most home runs, season – 55 by Ruth; ended the season with 59.

1927

*September 27: Most RBI, season – 172 by Lou Gehrig; ended season with 175. *September 30: Most home runs, season – 60 by Babe Ruth.

1930

*September 17: Most RBI, season – 176 by

Hack Wilson Lewis Robert "Hack" Wilson (April 26, 1900 – November 23, 1948) was an American Major League Baseball player who played 12 seasons for the New York Giants, Chicago Cubs, Brooklyn Dodgers and Philadelphia Phillies. Despite his diminutive statur ...

; ended season with 191.

1932

*July 10: Most hits in a game by a batter – 9 by Johnny Burnett

1941

* July 2: Longest hitting streak in a single season – 45 by Joe DiMaggio; extended to 56. * July 5: Longest hitting streak spanning one or more seasons – 46 by Joe DiMaggio; extended to 56.

1961

*October 1: Most home runs, season – 61 by

Roger Maris Roger Eugene Maris (September 10, 1934 – December 14, 1985) was an American professional baseball right fielder who played 12 seasons in Major League Baseball (MLB). He is best known for setting a new MLB single-season home run record with 61 ...

1974

*April 8: Most career home runs – 715 by Hank Aaron; ended his career in 1976 with 755.

1985

*September 8: Most career hits – 4,190 by Pete Rose; ended his career in 1986 with 4,256.

1987

*August 14: Most home runs by a rookie, season – 39 by Mark McGwire; later extended to 49.

1991

*May 1: Most career stolen bases – 939 by Rickey Henderson; ended his career in 2003 with 1,406.

1995

*September 6: Most consecutive games played – 2,131 by

Cal Ripken Jr. Calvin Edwin Ripken Jr. (born August 24, 1960), nicknamed "Iron man (sports streak), The Iron Man", is an American former baseball shortstop and third baseman who played 21 seasons in Major League Baseball (MLB) for the Baltimore Orioles (1981� ...

; later extended to 2,632 in 1998.

1997

*September 4 9: Most teams with which a player has hit 20 home runs in a season – 2 by Mark McGwire

1998

* June 25: Most home runs in a calendar month – 19 by

Sammy Sosa Samuel Peralta Sosa (born November 12, 1968) is a Dominican-American former professional baseball right fielder. He played in Major League Baseball (MLB) for 19 seasons, primarily with the Chicago Cubs. After playing for the Texas Rangers and C ...

(extended to 20 on June 30). * September 8: Most home runs, season – 62 by Mark McGwire; later extended to 70. Sosa also broke the 37-year-old record held by

and was briefly the sole record-holder, hitting his 66th home run of the season (which would be his final total) before McGwire did.

1999

*April 23: Most grand slams hit in one inning – 2 by

Fernando Tatís Fernando Gabriel Tatís Medina Sr. (born January 1, 1975) is a Dominican former professional baseball third baseman and Minor League Baseball (MiLB) manager. Over his 11-year Major League Baseball (MLB) career, Tatís played for the Texas R ...

*Most grand slams surrendered in one inning – 2 by

Chan Ho Park Chan Ho Park (; ; born June 30, 1973) is a South Korean former professional baseball pitcher. Park was the first South Korea-born player in MLB history. He played for the Los Angeles Dodgers, Texas Rangers, San Diego Padres, New York Mets, ...

2001

* October 4: Most career runs – 2,246 by Rickey Henderson; ended his career in 2003 with 2,295 * October 5: Most home runs, season – 71 by

Barry Bonds Barry Lamar Bonds (born July 24, 1964) is an American former professional baseball left fielder who played 22 seasons in Major League Baseball (MLB). Bonds was a member of the Pittsburgh Pirates from 1986 to 1992 and the San Francisco Giants f ...

(hit #72 in same game; finished season with 73) * Highest slugging percentage, season – .863 by Bonds.

2002

* April 30: Most franchises against which a pitcher has earned a win: 30 by Al Leiter * Highest on-base percentage, season – .582 by

2003

*September 17: Most extra-base hits, season, by a team – 608 by Boston Red Sox

2004

*July 10: Most intentional walks, season – 68 by

; broke his own record; finished season with 120 *October 6: Most hits in one season – 262 by

Ichiro Suzuki , also known mononymously as , is a Japanese former professional baseball outfielder who played professionally for 28 seasons. He played nine years of his career with the Orix BlueWave of Nippon Professional Baseball (NPB), where he began his ...

* Highest on-base percentage, season – .609 by Bonds.

2005

*June 8: Youngest player to reach 400 home run mark – Alex Rodriguez, age

2006

*April 28: Most consecutive games with a home run by a right-handed hitter – 7 by Kevin Mench *April 29: Most home runs in the month of April – 14 by

Albert Pujols José Alberto Pujols Alcántara () (); born January 16, 1980) is a Dominican-American former professional baseball first baseman, designated hitter and third baseman who played 22 seasons in Major League Baseball (MLB). Nicknamed "The Machine", ...

2007

*August 4: Youngest player to reach 500 career home runs – Alex Rodriguez, age *August 7: Most home runs, career – 756 by

; later extended to 762

2008

*April 2: Most consecutive games without an error for a first baseman – 194 by

Kevin Youkilis Kevin Edmund Youkilis (; born March 15, 1979), nicknamed "Youk" , is an American former professional baseball first baseman and third baseman, who primarily played for the Boston Red Sox. A native of Cincinnati, Ohio, he was drafted by the Red S ...

; later extended to 238 games *May 9: Most baserunners picked off, career – 92 Kenny Rogers *May 16: Most consecutive starts with a no-decision – 9 by Shawn Chacón

2009

*June 17: Most games caught – 2,227 by

Iván Rodríguez Iván Rodríguez Torres (born November 27, 1971), nicknamed "Pudge" and "I-Rod", is a Puerto Rican former Major League Baseball catcher. He played for the Texas Rangers (in two separate stints, comprising the majority of his career), Florida ...

; later extended to 2,427 games.

2010

*August 4: Youngest player to reach 600 career home runs – Alex Rodriguez, age

2011

* August 2: Most games hitting home runs from both sides of the plate in a career – 12 by Mark Teixeira *September 19: Most career saves – 602 by Mariano Rivera; later extended to 652 saves.

2012

* April 17: Oldest pitcher to win a game –

Jamie Moyer Jamie Moyer (born November 18, 1962) is an American former professional baseball pitcher. Over his 25-year career in Major League Baseball (MLB), Moyer pitched for the Chicago Cubs, Texas Rangers, St. Louis Cardinals, Baltimore Orioles, Boston R ...

, age . Extended record on May 16 (see below). * May 16: Oldest player to drive in a run – Moyer, age *June 23: Most walk-off home runs – 13 by Jim Thome

2013

*September 20: Most career grand slams – 24 by Alex Rodriguez; later extended to 25.

2015

*October 21: Most consecutive postseason games with a home run – 6 by Daniel Murphy

2017

*September 25: Most home runs by a rookie, season – 50 by

Aaron Judge Aaron James Judge (born April 26, 1992) is an American professional baseball outfielder for the New York Yankees of Major League Baseball (MLB). Judge was unanimously selected as the American League (AL) Rookie of the Year in 2017, and finishe ...

; later extended to 52.

2019

*September 28: Most home runs by a rookie, season – 53 by Pete Alonso

References

{{Baseball records Record breakers by season