I have been clamoring for this forever. This is an innovation that is long overdue. The evidence about starters going 3 times through the order is overwhelming, and has been as long as analytics have been a thing. Furthermore, relievers are under-utilized. The balance between starter IP's and reliever IP's is extreme. You couldn't get as many games of out relievers if you used them in long relief, but you could get more innings out of them. You'd just have to plan more carefully. Current orthopraxy is too obsessed with using relievers to micromanage matchups, which doesn't outweigh the importance of avoiding that last time through the order, not to mention having one less pa from your starting pitcher. The downside would be having to rest relievers more days, but it solves more problems than it creates. Heck, you might even be able to use just 4 starters regularly if you have enough relievers with options, mind your off-days, and use long relievers more. Another issue is that if your first long reliever bombs, you're in some trouble, but you're in trouble when a starter bombs anyway. We've seen this work in the playoffs so I don't understand why nobody has had the guts to try it. I know you don't get as many rest days in the regular season, but you can also cycle through more relievers during the regular season, whereas you're trying to stick with your 4-5 best relievers in the playoffs. Ironically, it would also allow you to micromanage matchups a little more in some cases. For example, if you have lhp long relievers and a team started all their lhb's against your rhp, you can pull your starter before his second pa and all of a sudden you've created a big matchup headache for the other manager. You can even plan to have your long relievers rested according to the rhb vs. lhb splits of the lineups you'll be facing in a given series, macro-managing those matchups instead of micro-managing them. I always thought it was incredibly weird to have lhp starters and then be stuck starting them against a dominant rhb lineup just because it was their turn in the rotation. Just get more innings out of relievers and stop putting starters through the order 3 times so often. The stats are pretty convincing. This notion that a starter is "rolling" so you can't pull him is stupid. Chances are pretty good that he'll stop "rolling" when he gets to the top of the order for the 3rd time - not to mention the fact that you probably wasted another pa to keep him in the game that long. This just isn't tenable in today's game. First off you are making it so that in probably half the games the starter can only get a loss or ND, even if they are pitching well. Wins and losses are far from the best way to evaluate a pitcher, but they still are considered, especially for starters, for post season awards, the AS game and contract negotiations. You may not think it is so important, but you can't implement something that will cause a player revolt, and when a plan will likely hurt players trying to get paid, the players will revolt. Second this limits roster flexibility. 4 starters, 5 long relievers, 1 closer and 3 others, assuming a 13 man staff. Going to 12 would be difficult to make work. Given all the times when a player or 2 are out with a minor injury, this limits your ability to send a pitcher down and bring a position player up. Third this ignores the dynamics of the game, particularly in the NL. What do you do in the 6th or 7th inning when the pitchers spot comes up? If you pinch hit, you now basically are reverting back to 1-2 inning relief pitchers, except with fewer who are available. Also you talk about macro-managing game plans, but there will always be times later in the game when you want to exploit a matchup. Again either you are reverting to short relievers or you stick with your 3ish inning reliever come hell or high water. Late in the game is when things start being played tighter because there isn't much time to make up a run. So basically this is likely only to work with larger rosters, the DH in the NL, and adjusting the pay and rewards grading of starting pitching.