I dont think starting a reliever forces an opposing manager to shift his lineup at all...and most teams have a combo of right and lefty hitters through the first few batters amongst their best hitters, which negates a platoon advantage that could be gained by opening the inning with a reliever. In this scenario, what happens when a reliever opening a game struggles? Are the presumed starters warming up early enough to get brought in quickly, or do they need to burn a 2nd pen arm to try and escape a jam? This could just as easily lead to burning a bullpen up quickly for a game, and if it's tight in the late innings forcing managers to leave guys in too long or not play matchups due to lack of options. I get that in theory it seems like it should work, but two romo appearances against a righty heavy angels lineup in mid may isn't the definitive proof that's where baseball is headed. I also think the presumed advantage of knowing an opposing lineup and then starting a game with a reliever based on the best matchup will be nipped in the bud - I think once lineups are posted, if a player or pitcher gets scratched before gametime they are done. Romo was basically the announced starter because they knew the Angels really didn't have LH options to put at the top of the order. Since ohtani wasn't going to be in the lineup sat or sun due to his pitching schedule, the angels had only valbuena and Calhoun as lh options on their whole roster, neither of which is an everyday option anywhere near the top of the lineup. Couple of counterpoints: 1) This wouldn't be an 'every turn through' scenario. It would only be used if advantageous. Like you mentioned, Romo was used because the Angels were RH heavy at the top. If the same scenario presented itself to Milwaukee, why not throw a RHP against 6 righties so Suter misses out on them for one turn through?... 2) "In this scenario, what happens when a reliever opening a game struggles?" - What if Suter struggles? Aren't you running the risk of anybody who starts the game struggling? A guy like Matt Albers is being under utilized (appearing in < 40% of games) because of how many great late inning options we have. Albers has only given up a run in 3 of his 19 appearances. So using small sample/silly math - we have an 85% chance of starting the game off with a clean inning or two before giving the ball to Suter to get us through 4 or 5 more. 3) "I dont think starting a reliever forces an opposing manager to shift his lineup at all...and most teams have a combo of right and lefty hitters through the first few batters amongst their best hitters, which negates a platoon advantage that could be gained by opening the inning with a reliever." I definitely agree. Most teams do. But some teams don't and if you catch them on a day when someone is nursing and injury or something so they are heavily RH ... use it to your advantage? 4) "Are the presumed starters warming up early enough to get brought in quickly?" Your 'real' starter begins the game knowing he is coming in in either the 2nd or 3rd ... he will be stretching and getting loose from the get go I would assume... Again, I'm not saying it is a sure thing. But if the right situation presents itself the Brewers have the right personnel to capitalize.