6th Sidney Weil quits as Cincinnati Reds president. Larry MacPhail acquires an interest in the team and is elected director. MacPhail will become GM.
15th Cards C Jimmie Wilson is swapped to the Phillies to become manager. St. Louis gets hard-hitting Virgil Davis in exchange.
17th Pittsburgh sends Alan Comorosky and Tony Piet to Cincinnati in exchange for P Red Lucas and Wally Roettger. As a pitcher, Lucas will feast on the Reds over the rest of his career, going 14–0 against them. Piet hit .323 for the season, but was in the doghouse over a contract dispute and never started a game after July.
21st Chuck Klein, who won the Triple Crown with the Phillies, is sold to the Chicago Cubs for $125,000 and veterans Mark Koenig, Harvey Hendrick, and Ted Kleinhans. Hendrick will play one year in Philley, while the other two quickly go to the Reds. Klein, who also led the NL in total bases, hits, slugging, doubles, was second in runs, and 4th in steals, is the only player to be traded after a Triple Crown season. Leaving cozy Baker Bowl, he will have two solid years at Wrigley before returning to the Phils. The Cubs would like to have this deal back.