I'm with Hippo...
Being from Tony LaRussa's Baseball Acadmemy here in the heartland, I've learned not to fall in love with these on the fence outfield types. Mather is a big dude, swings from his heels and definitely passes the eye test, but he'll play against lefties and nothing else is guaranteed. NL only, sure why not. Mixed leaguers, highly doubt it.
12 team, 5x5 roto