On May 4, 1869 — The Cincinnati Red Stockings, the first all-professional baseball team, start their first regular season with a 45 – 9 victory over the Great Westerns of Cincinnati.
Source:
Baseball Reference May 4
At the Polo Grounds, the Giants sweep a doubleheader from the Phils to run their win streak to 18 games. New York wins the opener, 4 – 1, behind Dummy Taylor then take the nitecap, 11 – 3, behind Christy Mathewson. Matty leaves after seven innings, leading 11 – 1. The streak of 18 games matches one rung up by the 1885 White Stockings and the 1894 Baltimore Orioles; the record is 20 games, held by the 1884 Providence Grays.
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July 4, 1904
