Winning percentage
Win% Wins Losses Year Team Comment
.798 67 17 1880 Chicago White Stockings best pre-modern season
.763 116 36 1906 Chicago Cubs best 154-game NL season
.721 111 43 1954 Cleveland Indians best 154-game AL season
.716 116 46 2001 Seattle Mariners best 162-game AL season
.667 108 54 1975 Cincinnati Reds best 162-game NL season
.250 40 120 1962 New York Mets worst 162-game NL season ( 2 games rained out )
.265 43 119 2003 Detroit Tigers worst 162-game AL season
.248 38 115 1935 Boston Braves worst 154-game NL season
.235 36 117 1916 Philadelphia Athletics worst 154-game AL season
.130 20 134 1899 Cleveland Spiders worst season ever
Statistics -- Major League Baseball
In sports, a winning percentage is the fraction of games or matches a team or individual has won. It is defined as wins divided by the total number of matches played (i.e. wins plus draws plus losses). A draw counts as a ​1⁄2 win. For example, if a team's season record is 30 wins and 20 losses, the winning percentage would be 60% or 0.600. If a team's season record is 30-15-5 (i.e. it has won thirty games, lost fifteen and tied five times), the five tie games are counted as 2​1⁄2 wins, and so the team has an adjusted record of 32​1⁄2 wins, resulting in a 65% or .650 winning percentage for the fifty total games from