Isn´t language important to play baseball?

I don´t known much about baseball or the major leagues, but last year I was watching the last game of the world series and saw this asian dude who win an award to the most important player of the series  giving his speach with the help of a translator, because it seems he coudnt speak english.
And today saw this trailer with two basebal payers?  talking in spanish for a commercial of an american game  
So, If there is in GB someone that knows more about this sport than me. could you please solve this mistery?
  

Perhaps they're good baseball players?

He probably speaks decent enough english to be able to talk to his team mates & coaches, but not to the media. You have to remember that the media will pick up on anything that he says, so he could say something negative accidentally that he doesn't actually mean, and the media will go crazy over it. 
 
Fabio Capello (the manager of the England national football team) spoke his native Italian to the press when he first started the job for that very reason. He didn't want to say something he didn't really mean, and have the press go crazy over it. He could communicate with the players fine, but he wasn't confident enough with his english to speak to the media. He speaks in english to the press fine now that he has more experience with the language.

Well, wouldn't be a problem in this league. ;)
 
But seriously, what extremeradical said.
I'm guessing these baseball players were chosen on their ability to play baseball. 
 
And well, if that "asian dude" is doing well enough to an award for being the most important player, just maybe language isn't that big an issue?

The calls in baseball are simple enough for anybody to understand. Strike, out, ball, et cetera. I believe they're even the same in Japanese. In terms of strategy, look to Yao Ming, who had a personal assistant/translator with him all the time back in the day. The translator literally becomes a member of the team, because they're assisting in terms of communication with the coach and other players.
 
If you're a slugger, though, then there's no real need for communication. Yes, just hit the ball down the pitch, and a long way down. Thank you very much.