It is entirely possible and entirely practical, in modern baseball, for a team to use a three-man starting rotation. I realize that this is probably not going to happen, but ... this is how it could work, and this is why it would work.
Suppose that a team used a three-man starting rotation, but limited each pitcher to 80 pitches a start or five innings. (This actually would work with 90 pitches a start, but 80 is more conservative, so I'm going to use 80 as a working premise.) Anyway, a starting pitcher always and absolutely comes out of the game as soon as
1) He has pitched five innings, or
2) He has thrown 80 pitches.
No exceptions. Eighty pitches, it's the fifth inning, you're ahead 9-0 and you have two outs and two strikes on the hitter ... tough luck, Sally, you should have thrown more strikes earlier in the game.
Bill expands upon this proposal in great detail, and I highly recommend that if you're interested in this idea -- and if you're here, how could you not be -- you read the whole thing. Just in case you're too busy, though, a quick outline:
1) The current system is not keeping pitchers healthier than the system of 40 years ago did;
2) the current system, which focuses on pitching every fifth day and throwing no more than 110 or 120 pitches per start, has actually resulted in less durability, not more; and
3) pitchers could throw more often, and more innings per season, if they threw fewer pitches per start.
Which leads to Bill's proposal, three-man rotations and strict in-game limits of five innings or 80 pitches, whichever comes first. In practice, Bill says, nobody wound wind up with more than around 245 innings in a season. That's not a huge number when you consider that seven major leaguers topped 220 innings in the 2015 regular season.
But now you're getting 10-25 percent more innings from your three best starters, and 100 percent fewer innings from your worst starters (not counting injuries, of course). Meanwhile, your starter is literally never pitching to the opposing lineup a third time in a game. Which, again, is a good thing.
Who soaks up the rest of the innings? Well, Bill says an eight-man bullpen can handle things: closer, eighth-inning guy, three sixth- and seventh-inning guys, two situational lefties, and another lefty or a long man. If the starting pitchers pitch a little less than five innings per start that'll be 760 innings per season," Bill writes, "which leaves about 700 for the bullpen. With eight relievers that's 88 innings per reliever. That doesn't strike me as an extraordinary number."
http://www.foxsports.com/mlb/just-a-...bullpen-112515
Interesting read. The Astros tried something similar to this in their farm system. The starter would pitch 5 innings, and a "2nd starter" would finish the last 4. They would then rotate on the next start. They did this to try and keep their arms fresh through the year. Evidently something is wrong now. I never remember seeing this many injuries watching pitchers when I was a kid in the 70's. Hell, I don't remember seeing to many relief pitchers because we had so many complete games back then.
