Question: What is the worst season record in mlb history?
Disambiguated questions and answers: question: What is the worst season record in mlb history in terms of winning percentage?
What is the worst season record in mlb history in terms of wins/losses?
What is the team with the worst season record in mlb history?
answer: .130
20-134
Cleveland Spiders
Natural Questions answer: 20 -- 134 (from the Wikipedia article "List of worst Major League Baseball season records")