Template:Today in Baseball/March 17
- 1884 - The Union Association opens its first (and only) season that some consider to be of major league status. Bill Sweeney picks up the first of his 40 wins.
- 1886 - The Sporting News (later to be known as the Bible of Baseball) publishes its first issue.
- 1946 - The Montreal Royals and Brooklyn Dodgers face off; Montreal features Jackie Robinson, marking the first contest by an integrated team in Organized Baseball in the 20th Century.
- 1990 - The Chinese Professional Baseball League opens its first season. The Brother Elephants lose to the President Lions, 4-3. Fu-Ming Tu gets the win. Yung-Tai Sung gets the first hit in league history.
- 2005 - In a hearing before the Committee on Government Reform, Mark McGwire refuses to testify about whether he took steroids. Rafael Palmeiro (pictured) angrily denies ever taking them; he later will be suspended for positive steroid tests.