| Postseason: |
Won World Series (4-3) over Detroit Tigers |

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Transactions listed are from November 1 of previous year to April 1 of the following year.
1909
Sold Warren Gill to Minneapolis (American Association) for $2,500.
Sold Irv Young to Minneapolis (American Association) for $2,500.
March 1, 1909
Purchased Mike Simon from the Boston Doves.
May 28, 1909 (Standings)
Traded Ward Miller and cash to the Cincinnati Reds. Received Kid Durbin.
June 18, 1909 (Standings)
Released Roy Thomas.
July 7, 1909 (Standings)
Purchased Harry Camnitz from McKeesport (Ohio-Pennsylvania).
July 16, 1909 (Standings)
Sold Charlie Starr to the Boston Doves.
July 27, 1909 (Standings)
Purchased Vin Campbell from Aberdeen (Northwestern).
August, 1909 (Standings)
Purchased Gene Moore from Dallas (Texas). (Date given is approximate. Exact date is uncertain.)
August 19, 1909 (Standings)
Traded Jap Barbeau and Alan Storke to the St. Louis Cardinals. Received Bobby Byrne.
September, 1909 (Standings)
Drafted Red Faber from Dubuque (Three-I) in the 1909 rule 5 draft.
September 1, 1909 (Standings)
Drafted Bud Sharpe from Newark (Eastern) in the 1909 rule 5 draft.
Drafted Lefty Webb from Grand Rapids (Central) in the 1909 rule 5 draft.
December 14, 1909
Purchased John Flynn from St Paul (American Association) for $4,000.
January 6, 1910
Bill Abstein selected by the St. Louis Browns off waivers.
February 15, 1910
Sold Vic Willis to the St. Louis Cardinals.