SYDNEY -- They wouldn't rumble Down Under, would they?The Los Angeles Dodgers and Arizona Diamondbacks were chosen to be the 2014 ambassadors of Major League Baseball. They're in Australia's largest city preparing for their Opening Series games Saturday and Sunday. This is just the sixth time MLB has opened its season abroad and Australia is viewed as ripe territory to grow the game globally.But there's this nagging little worry out there, a potential embarrassment for the league: What if the teams fight?