All Time single season baseball leaders (in my lifetime)

Batting Average:
George Brett .390 (1980)

Tony Gwynn .394 (1994)

OBP:
Barry Bonds .609 (2004)

Non-Steroid OBP:
Frank Thomas .487 (1994)

Wade Boggs .476 (1988)

SLG:
Barry Bonds .863 (2001)

Jeff Bagwell .750 (1994)

Larry Walker .720 (1997)

At Bats:
Jimmy Rollins 716 (2007)

Runs:
Jeff Bagwell 152 (2000)

Hits:
Ichiro: 262 (2004)

Doubles:
Todd Helton 59 (2000)

Triples:
Curtis Granderson 23 (2007)

Home Runs:
Barry Bonds 73 (2001)

Ryan Howard 58 (2006)

RBI:
Manny Ramirez 165 (1999)

Andres Galarraga 150 (1996)

Walks:
Barry Bonds 232 (2004)

Jeff Bagwell 149 (1999)

Strikeouts:
Mark Reynolds 223 (2009)

Steals:
Rickey Henderson 130 (1982)

OPS:
Barry Bonds 1.421 (2004)

Frank Thomas 1.217 (1994)

Larry Walker 1.171 (1997)

Pitchers

ERA :

Dwight Gooden 1.53 (1985)

Wins:
Steve Carlton 27 (1972)

Bob Welch 27 (1990)

Games:
Mike Marshall 106 (1974)

Saves:
Francisco Rodriguez 62 (2008)

IP:
Wilbur Wood 376 2/3 (1972)

Strikeouts:
Nolan Ryan 383 (1973)

Complete Games:
Catfish Hunter 30 (1975)

Shutouts:
John Tudor 10 (1985)

Game Starts:
Wilbur Wood 49 (1972)

Walks:
Nolan Ryan 204 (1977)

Losses:
Steve Arlin 21 (1972)

Steve Bahnsen 21 (1973)

Mike Maroth 21 (2003)