Mark Vientos has been here before. In fact, he is quite used to it.

And while he and the Mets would obviously prefer the exception — to be coming off a breakout season like he was at this time last year, looking like a key part of the club’s future — Vientos is embracing a familiar feeling in an uncertain offseason following a rough year in Queens.

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“It feels like last year was a lot different from every other year, so I think [this year] is a lot similar to every other year that I had to come back and prove myself again,” Vientos said Friday after handing out turkeys to hundreds of people in need at

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