1st Baseball rules committee chairman Tom Loftus of Washington proclaims that the pitcher’s box must not be more than 15 inches higher than the baselines or home plate.
7th In the first trade under the peace treaty, the Giants send their 1902 part-time manager Heine Smith to Detroit for 2B Kid Gleason, who is immediately moved to the Phils where he will end a 20-year playing career.
8th Chicago Colts president James Hart and White Sox president Charles Comiskey announce that the two teams will play a city-series championship after the 1903 season. The best-of-15 series will start October 1 and will end when one team has won eight games. Only players who appeared in 20 regular season games (10 for pitchers and catchers) will be eligible (Vineline).
12th The New York Highlanders are officially approved as members of the AL.
20th The 2 Major Leagues agree to blacklist future contract jumpers.
21st Sporting Life, the nation’s oldest baseball publication, begins its 21st year. It will close during WW I.