Bob DiPietro, 1951 Boston Red Sox. DiPietro's major league career consisted of four late September games for the '51 Sox (dunno when the photo was taken since the '51 sleeve patch is missing). I've seen three other b&w images of this player, none very good. This one's a cleaned sample from a scan of a recently purchased photo.
***edited to add- the baseball-reference photo on DiPietro's page (a severely square-jawed guy in a Louisville Colonels uniform) ain't him... I have eight other DiPietro images in my files, and the bb-ref image, taken from a lexibell scan IDed as DiPietro, is the one outlier.