Analyzing Starting Pitcher Trends: From Aces to Relievers

I have followed MLB since about 1956 by buying baseball cards, by listening to baseball games on the radio, by subscribing to The Sporting News and reading whatever box scores I could find. But how things have changed over the years, including pitching. One of the biggest changes has to do with starting pitching.

Starting pitchers used to pitch and hit back in the day. They would start every fourth day but over time the starting rotation changed to four to five. Recently some teams have gone to six day rotations and it is not that uncommon nowadays for games to be pitched totally by relief pitchers. Relief pitchers back then were “injured” starters or starters that for one reason or another had become ineffective.