Three

[Edgy MD]

Carson Benge, who would have been a rock-solid choice to take over #8, has been outfitted in #3, inheriting the digit from Jesse Winker.

As Mets by the Numbers has noted, one overlooked part of the Mets' offseason housecleaning is how many single-digit numbers were freed up, as 1, 2, 3, 6, and 9 were all sent packing.

You can add the retirement of #5 in July and you can argue that a form of arithmophobia consumed the team.

[A Boy Named Seo]

As a rightfielder, #9 would've been kinda cool. But BENGE 3 looks great, too. 

[Benjamin Grimm]

I can think of a pretty good right fielder who wore number 3.

[Centerfield]

5 minutes ago, Benjamin Grimm said:

I can think of a pretty good right fielder who wore number 3.

Me too!  But did you mean Curtis Granderson or Carl Everett?

[Benjamin Grimm]

Herm Winningham! Duh!

[seawolf17]

8 minutes ago, Benjamin Grimm said:

I can think of a pretty good right fielder who wore number 3.