Glossary of English language idioms derived from baseball
Charly horse, cover one’s bases and rain check are three idioms I was not aware originated with baseball. There are many more.
Reviewers! Turns out Wikipedia pretty much already has you set: “Sometimes referred to as ‘America’s pastime,’ baseball has especially affected the language of other competitive activities such as politics and business.” Hit your review of The Art of Fielding out of the park! (via Emily)