Let me tell you what I love about deadline day in New York. The city gets two teams, two payrolls, two sets of expectations, and every year they show up at the same crossroads looking for completely different things. ESPN's deadline breakdown works through what each club might do, and the question it keeps circling back to is the one the whole summer has been asking. Who are these teams, really?

Start in Queens. The Mets are the classic team staring at the mirror this time of year. If they've played well enough to stay in the Wild Card conversation they should be adding, and I mean real additions, not a bench bat and a prayer. If they've stumbled, the conversation changes fast, because this roster has pieces other clubs would pay real prospects for. That's the brutal arithmetic of a deadline. You're either all in or you're holding a yard sale, and the worst thing a front office can do is stand pat in the middle while telling fans the roster is fine. It never is.

I've said it before and I'll say it again. Deadlines are won by general managers who read the clubhouse, not by analytic models. The numbers tell you what a player is worth. They don't tell you whether the guys next to his locker believe. A GM who knows his room adds a piece that fits. A GM who only knows the spreadsheet adds a name and spends September wondering why the clubhouse went quiet.

Now the Bronx. The Yankees are a different animal. Where they shop, that I leave to the ESPN piece and the hours ahead. What I'll say is that contenders of their stripe are never shopping for one thing. October rosters get built at the edges as much as in the middle, and the little things, the matchups, the bench, the eighth inning, are what decide a Division Series.

Every old-timer in this business has a deadline story he loves and one he'd rather forget, and that's the point. I never trust anyone who tells you a deadline was won or lost on deadline day itself. You find out in October. Or sometimes two Octobers later, when the prospect you traded is wearing somebody else's hat in a playoff highlight.

And Mets fans know that feeling better than anyone. Every generation of that fan base has one deadline trade they can recite from memory, one deal that either changed the temperature of an entire summer or froze it solid. When the fit is right a deadline can do that for you. When it isn't, it does it to you. It doesn't happen often. But when it does, you never forget it.

So watch the next 24 hours with this in mind. The Yankees are shopping for October. The Mets are deciding who they are. One team knows its identity and the other is still writing it. And if the Mets brass looks around that clubhouse and doesn't like what it sees, then holding onto veterans out of sentiment would be the kind of mistake that costs you two rebuilds instead of one.

Deadline day. Best day of the summer that doesn't involve an actual game being played. Somebody's season changes today and nobody knows whose yet.