The Mets introduced a high-powered reliever who is aware there is another looming.

Devin Williams, who has been a closer and has been a setup man in his career and had spurts in both roles last season with the Yankees, is like many Mets fans and hoping he will have help shutting down the late innings: He wants Edwin Díaz in the club’s bullpen , too.

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“I think it’s just a good situation,” Williams said in his introductory video call Friday. “If he comes back, I think we’re going to have a really good back end of the pen. So, more good arms is always a good thing.”

The Mets believe they reeled in one

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