By Nick Selbe They are off to disappointing starts with their new teams after signing megadeals this offseason. Is it time to panic? Welcome to The Opener, where every weekday morning during the regular season you’ll get a fresh, topical story to start your day from one of SI.com’s MLB writers. Twenty-five years ago—long before Avengers: Infinity War staked its claim to this title—the most ambitious crossover event in history took place. High art and baseball became intertwined in the form of a monumental photoshoot featuring a quintet of then-young shortstops (you know the one). One could arg…