Yoi and Double Yoi
Others would know better, but my guess is that Nessler has not. Nantz is not a baseball guy, however, he has been around so long and filled so many different shoes during his career that it would not surprise me if he had done the odd baseball broadcast here and there...you know, as a fill-in when nobody else was available.
u_bin_called
At the real, major professional level? No.
Nessler came up through the college football and college basketball ranks before getting noticed by CBS and ESPN.
Nantz has done just about every sport BUT baseball...and the reason why I added "real" above was because he did play a baseball announcer on a TV show years ago...