List of Major League Baseball record breakers by season
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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:
July 19: Most home runs, season – 30 by Babe Ruth; ended the season with 54.
Highest slugging percentage, season – .847 by Ruth.
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.
September 27: Most RBI, season – 172 by Lou Gehrig; ended season with 175.
September 30: Most home runs, season – 60 by Babe Ruth.
September 17: Most RBI, season – 176 by Hack Wilson; ended season with 191.
June 25: Most home runs in a calendar month – 19 by Sammy Sosa (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 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.
April 23: Most grand slams hit in one inning – 2 by Fernando Tatís[4]
Most grand slams surrendered in one inning – 2 by Chan Ho Park[5]
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 (hit #72 in same game; finished season with 73)
Highest slugging percentage, season – .863 by Bonds.
April 30: Most franchises against which a pitcher has earned a win: 30 by Al Leiter
Highest on-base percentage, season – .582 by Barry Bonds.
September 17: Most extra-base hits, season, by a team – 608 by Boston Red Sox
July 10: Most intentional walks, season – 68 by Barry Bonds; broke his own record; finished season with 120
October 6: Most hits in one season – 262 by Ichiro Suzuki
Highest on-base percentage, season – .609 by Bonds.
June 8: Youngest player to reach 400 home run mark – Alex Rodriguez, age 29years, 316days
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
August 4: Youngest player to reach 500 career home runs – Alex Rodriguez, age 32years, 8days
August 7: Most home runs, career – 756 by Barry Bonds; later extended to 762
April 2: Most consecutive games without an error for a first baseman – 194 by Kevin Youkilis; later extended to 238 games[6]
May 9: Most baserunners picked off, career – 92 Kenny Rogers(since stat was first recorded in 1974)