All Time Records	Single Season Records	MLB Milesontes
Career BA Leaders	Highest BA in a Season	No Hitters and Perfect Games
Career Hits Leaders	Most Hits in a Season	300 Wins Club
Career HR Leaders	Most HRs in a Season	3000 Strikeouts Club
Career RBI Leaders	Most RBIs in a Season	500 Home Run Club
Career Runs Leaders	Most Runs in a Season	3000 Hits Club
Career SB Leaders	Most SBs in a Season	Triple Crown Winners
Career Wins Leaders	Most Saves in a Season
Career Saves Leaders	Most K's in a Season
Career K Leaders	Lowest ERA in a Season
Career ERA Leaders

In 2008, Los Angeles Angels Closer Francisco Rodriguez set the MLB record for most saves in a single season with 62. K Rod beat Bobby Thigpen's 18 year old by 5 saves and became the only MLB Closer to records over 60 saves in a season.

When Thigpen set the record in 1990, he was the only MLB pitcher to record over 50 saves. There have now been 11 seasons in which a pitcher has recorded 50 or more saves. Eric Gagne and Mariano Rivera have each record 50+ save seasons twice.

Most Saves in a Single MLB Season
Rank	Player	Team	Saves	Year
1	Francisco Rodriguez	Los Angeles Angels	62	2008
2	Bobby Thigpen	Chicago White Sox	57	1990
T3	Eric Gagne	Los Angeles Dodgers	55	2003
T3	John Smoltz	John Smoltz	55	2002
T5	Trevor Hoffman	San Diego Padres	53	1998
T5	Randy Myers	Chicago Cubs	53	1993
T5	Mariano Rivera	New York Yankees	53	2004
8	Eric Gagne	Los Angeles Dodgers	52	2002
T9	Rod Beck	Chicago Cubs	51	1998
T9	Dennis Eckersley	Oakland Athletics	51	1992
11	Mariano Rivera	New York Yankees	50	2001
12	Francisco Cordero	Texas Rangers	49	2004
T13	Rod Beck	San Francisco Giants	48	1993
	Dennis Eckersley	Oakland Athletics	48	1990
	Jeff Shaw	Cincinnati Reds Los Angeles Dodgers	48	1998
	Brian Fuentes	Los Angeles Angels	48	2009
	Brian Wilson	San Francisco Giants	48	2010
T18	Armando Benitez	Florida Marlins	47	2004
	Chad Cordero	Washington Nationals	47	2005
	Jason Isringhausen	St. Louis Cardinals	47	2004
	Francisco Rodriguez	Los Angeles Angels	47	2006
	Lee Smith	St. Louis Cardinals	47	1991
	Jose Valverde	Arizona Diamondbacks	47	2007
	Joe Nathan	Minnesota Twins	47	2009
	Heath Bell	San Diego Padres	47	2010
T26	Tom Gordon	Boston Red Sox	46	1998
	Bryan Harvey	California Angels	46	1991
	Trevor Hoffman	San Diego Padres	46	2006
	Jose Mesa	Cleveland Indians	46	1995
	Dave Righetti	New York Yankees	46	1986
	Lee Smith	St. Louis Cardinals New York Yankees	46	1993
	Mike Williams	Pittsburgh Pirates	46	2002
T33	Antonio Alfonseca	Florida Marlins	45	2000
	Joe Borowski	Cleveland Indians	45	2007
	Dennis Eckersley	Oakland Athletics	45	1988
	Eric Gagne	Los Angeles Dodgers	45	2004
	Eddie Guardado	Minnesota Twins	45	2002
	Bryan Harvey	Florida Marlins	45	1993
	Jose Mesa	Philadelphia Phillies	45	2002
	Jeff Montgomery	Kansas City Royals	45	1993
	Randy Myers	Baltimore Orioles	45	1997
	Robb Nen	San Francisco Giants	45	2001
	Dan Quisenberry	Kansas City Royals	45	1983
	Mariano Rivera	New York Yankees	45	1999
	Francisco Rodriguez	Los Angeles Angels	45	2005
	Kazuhiro Sasaki	Seattle Mariners	45	2001
	John Smoltz	Atlanta Braves	45	2003
	Bruce Sutter	St. Louis Cardinals	45	1984
	Duane Ward	Toronto Blue Jays	45	1993
	Bob Wickman	Cleveland Indians	45	2005
	Rafael Soriano	Tampa Bay Rays	45	2010
T52	Jeff Brantley	Cincinnati Reds	44	1996
	Francisco Cordero	Milwaukee Brewers	44	2007
	Mark Davis	San Diego Padres	44	1989
	Billy Koch	Oakland Athletics	44	2002
	Joe Nathan	Minnesota Twins	44	2004
	Dan Quisenberry	Kansas City Royals	44	1984
	Mariano Rivera	New York Yankees	44	2009
	Mariano Rivera	New York Yankees	44	2010
	John Smoltz	Atlanta Braves	44	2004
	Jose Valverde	Houston Astros	44	2008
	Billy Wagner	Houston Astros	44	2003
	Todd Worrell	Los Angeles Dodgers	44	1996

Updated: Mar. 25th 2011

Sources:
baseball-reference.com
baseball-almanac.com
wikipedia.org
thebaseballcube.com