The Mets are gearing up for Opening Day against Milwaukee Brewers. J.D. Martinez's signing adds depth to protect Pete Alonso. With Kodai Senga's injury, starting rotation depth is crucial. The team faces final roster decisions, including Mark Vientos. The starting rotation shows promise, including the development of prospects. The bullpen has strong contenders for final spots, with Fujinami headed to the minors. The bench spots are mostly decided, but a choice between Mark Vientos and others remains.