Major league baseball most wins in a season?
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What Major League Baseball pitcher has the most wins in a season?
Old Hoss Radbourn
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What Major League Baseball team has the most wins in a season?
Seattle Mariners
List of Major League Baseball single-season records
https://en.wikipedia.org/wiki/List%20of%20Major%20League%20Baseball%20single-season%20records
Charles Gardner Radbourn (December 11, 1854 – February 5, 1897), nicknamed "Old Hoss", was an American professional baseball pitcher who played 12 seasons in Major League Baseball (MLB). 
Charles Radbourn
His 60 wins in a season is a record which is expected never to be broken because no starter has made even as many as 37 starts in a season since 1991.
Charles Radbourn
The Mariners won 116 games in 2001, which set the American League record for most wins in a single season and tied the 1906 Chicago Cubs for the Major League record for most wins in a single season.
Seattle Mariners
Charles Gardner Radbourn, also known as Old Hoss Radbourn, is the American pitcher with most wins in Major League Baseball in a season. His 60 wins in a season record is expected never to be broken, since no starter has made even as many as 37 starts in a season since 1991. The team with most wins in a MLB season is the Seattle Mariners, with 116 games in 2001.