[Matt from TN]

We are now 22 seasons in. Here is a look at the current single-season and active leaders in key categories. Let me know if there are any other stats you are interested in.

SS = Single Season
CA = Career Leader
AC = Active Leader if different than career leader

Batting Records

Batting Average
SS - .421 Live Oak Taylor, 1889
CA - .377 Live Oak Taylor, 1888-91
AC - .363 Pete Browning, 1891-97

OPS
SS - 1.072 Ross Barnes, 1884
CA - .946 Ross Barnes, 1876-87
AC - .892 Pete Browning, 1891-97

Runs
SS - 117 Ed Delahanty, 1897
CA - 1343 Jack Glasscock, 1879-97

Homeruns
SS - 15 Jimmy Ryan, 1892
SS - 15 Jack McGeachy, 1897
CA - 98 Dan Brouthers, 1879-96
AC - 93 Sam Thompson, 1885-97

RBI
SS - 113 Nap Lajoie, 1897
CA - 1154 Buttercup Dickerson, 1879-96
AC - 970 Sam Thompson, 1885-97

Stolen Bases
SS - 78 Dave Foutz, 1891
CA - 479 Bob Glenalvin, 1890-97

Walks
SS - 121 Ross Barnes, 1876
CA - 734 Ross Barnes, 1876-87
AC - 431 Jimmy Ryan, 1886-97


Pitching Records

ERA
SS - 1.53 George Bradley, 1879
CA - 2.75 Lady Baldwin, 1885-97

Wins
SS - 41 Al Spalding, 1876
CA - 332 Laurie Reis, 1877-97

Winning %
SS - 84.85% Jocko Flynn, 1897
CA - 65.29% Lady Baldwin, 1885-97

Shutouts
SS - 9 Lady Baldwin, 1889
CA - 45 Joe Borden, 1876-93
AC - 41 Laurie Reis, 1877-97
AC - 41 Lady Baldwin, 1885-97

Strikeouts
SS - 283 Bill Daley, 1897
CA - 2484 Laurie Reis, 1877-97


Team Records

Wins - 87, Cleveland Spiders, 1891
Losses - 102, Baltimore Orioles, 1892

Win % - .717, Chicago White Stockings, 1878
Win % - .271, Baltimore Orioles, 1892

Avg - .316, Pittsburgh Pirates, 1897
Avg - .211, Worcester Ruby Legs, 1880

Runs - 798, Philadelphia Phillies, 1897

ERA - 2.28, Buffalo Bisons, 1879
ERA - 5.52, Philadelphia Athletics, 1876