Players Required over the Years

Thursday, June 24 2021 @ 01:02 PM EDT

Contributed by: John Northey

Just was thinking about the pen and how many were used there this year and the injuries so I thought 'how has this changed over the years'?

All data via the Lahman database (http://www.seanlahman.com/)

Some basics to start...

For starting pitchers...
Clearly for starters things have shifted.  Underhand to overhand shifted from under 3 to 7-8, then it grew to just over 10 by 1919 when Ruth started mashing.  It stayed there for decades, through the Jays WS years. but the last 5 years it has jumped again.  Openers are the cause I'd say - shifting it as much as dead ball to live ball did.

For Relief pitchers....
Visual Summary...
 
Looking at this I'd call Tony LaRussa the greatest villain in MLB history for pushing the pen to its limits in the 80's/90's.  But boy there was a killer spike there in the 10's.  2013 set the record at 17.5 relievers used, broken in 2014, broken again in 2015 and so on through 2019.  Way past time for tighter rules.  Starters had a blip but that blip matches one post WWII, however relievers are growing and growing out of control.  The 3 batter minimum I suspect is just the start.  Might need to limit bullpen sizes (as already planned) and increase time guys must stay down if demoted among other items.

For fun, an oddball item I ran into while researching this...
Oliver Drake set the record for most teams pitched on in 2018 with 5 teams including the Jays (1 2/3 IP over 2 games) - started with Milwaukee, purchased by Cleveland, taken off waivers by the Angels, off waivers by the Jays, off waivers by the Twins, post season waivers by the Rays, waivers by the Jays, purchased by Rays and still there now.  Wow.  Guy must have had no idea who he was pitching for day to day.  Still only counts as one pitcher that season though.

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