The Seattle Mariners posted their best record in 2001. They finished the season with 116 wins and 46 losses. They set the American League record and also tied a Major League record for most wins during a 162-game season.
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112 ... the Mariners record that season was 49-63.
In 1997, the Seattle Mariners hit 264 home runs to set the MLB record.
For starters, that is Randy Johnson of the 1995 Mariners with a win percentage of .900 (record was 18-2).
Seattle Mariners 2001 116-46 (regular season) or 1998 Yankees 125-50 including playoffs.
The first season of the Seattle Mariners was 1977.