Events in Sports History in March 1903

Mar 1 Major League Baseball Rules Committee rule that pitcher's mound must not be more than 15 inches higher than the baselines or home plate

Mar 4 Stanley Cup, Montreal Arena, Westmount, Quebec: Montreal HC beats Winnipeg Victorias, 4-1 for a 2-1 challenge series victory

Mar 12 New York Highlanders (Yankees) baseball franchise is approved as a member of the American League