Chris Flexen, the Class AA starter called up to make tonight’s start in San Diego in place of the injured Zack Wheeler, will be the first Met to wear 64 since Akeel Morris in 2015, another minor leaguer who made a big jump to the big leagues.

Let’s hope this promotion turns out better for Flexen than it did for Morris, who was bombed for 5 earned runs in 2/3rds of an inning, sent back to Class A afterwards, and eventually got traded to Atlanta in one or another of the Kelly Johnson deals.

Flexen you might recall was also considered to have been one of the guys who was on the way out in the Jay Bruce deal last summer but was rejected by the Reds due to physical concerns so perhaps he fits right in as a Met.

At any rate, he’s the first minor leaguer called up this week but likely not the last as time ticks down for the Mets to rid themselves of anything of short-term value, namely closer Addison Reed and perhaps, Asdrubal Cabrera, Neil Walker, Rene Rivera, Curtis Granderson and Lucas Duda, all of whom have come up in rumors. Of those names it will be bittersweet to part with the last few. I’ve always liked Big Duda, who I’m sure is ultimately destined to mash a million home runs as a DH for some AL West team, and Granderson is a terrific pro who’d probably be a nice emotional investment for a playoff-bound club.

But, they aren’t going anywhere with the 2017 Mets who have been betrayed by the health and consistency of their starting pitching, particularly Steven Matz who has probably been the most frustrating guy to root for, either throwing a gem, getting bombed or getting hurt — nothing in between for this guy. I also think it’s been proven their qualifying-offer gambit with Walker was a disaster: This was a useful guy, for sure, but hardly vital given the fact there were 5 other guys who can second base and aren’t spending a second straight year on the disabled list, and aren’t making $17 million. In the end that cash would have been better used for some more relief pitching. The lesson: Don’t go into a year with guys you’d prefer not to have.

I think it’s also likely that after months of waiting we’ll see AAA prospects Amed Rosario and Dominic Smith shortly, the latter particularly if Duda goes. Rosario we’ve established wears No. 1 and that appears to have been reserved for him. Smith is rocking No. 22 in Las Vegas and could take it over upon a recall if coach Tom Goodwin will part with it, with one of or the other of them inheriting Duda’s surrendered No. 21, Walker’s given-up 20 or even Cabrera’s 13.