On This Date in Sports March 15, 1869: Going Professional

Boys Among Men: How the Prep-to-Pro Generation Redefined the NBA and Sparked a Basketball Revolution: 9780804139274: Abrams, Jonathan: Books

Today in History, March 15, 44 B.C.: Julius Caesar assassinated on Ides of March

Princeton University Athletics

Football Begins 2023 Home Campaign Vs. Bryant - Princeton University Athletics

Pro baseball began in Cincinnati in 1869

Canada's First Professional Baseball League – Society for American Baseball Research

On this day in history, March 15, 1869, Cincinnati Red Stockings become first professional baseball team

The Unknown Matisse: A Life of Henri Matisse: The Early Years, 1869-1908: Spurling, Hilary: 9780375711336: : Books

Major League Baseball - Wikipedia

College football - Wikipedia

Phillies won't put Harper on 60-day IL at start of season

On this day in history, March 15, 1869, Cincinnati Red Stockings become first professional baseball team

Australian Baseball: A Brief History, by John Thorn

Season-long tribute planned to pioneering 1869 Red Stockings

On this day in history, March 7, 1857, baseball adopts nine players, nine innings as standard of competition