I was surprised when I had read speculation about what MLB would sign him because I thought he was going back to Cuba after the Giants let him go last fall. Turns out he defected during his return trip which is why he's eligible to sign with the Cardinals.
I'm only aware of three Japanese baseball cards for Mendoza - a "bonus"2014 BBM 2nd Version card that was an insert with Sports Card Magazine #107 and cards in the BBM Giants team sets in 2015 and 2016. It's possible he has a card in one of the Bandai Owners League sets in 2014 or 2015 or a Giants team issued set but I don't know about any.
|SCM #281 (2014 BBM 2nd Version #706)|
|2015 BBM Giants #G33|
|2016 BBM Giants #G30|