Tuesday is a big day in the baseball world, as minor-league seasons for all four full-season levels get under way. This is an even bigger deal than usual, of course, because these will be the first minor-league games since the end of the 2019 season. For those of us who love following this stuff, it’s been a very long wait and it will be a very welcome return. Of course, there are a few changes in the structure with MLB messing with the minors and removing the non-complex short-season leagues. For the Red Sox, that means no Lowell Spinners.