Justin Bieber's NEVER SAY NEVER acoustic premieres at World Series tomorrow

Justin Bieber wore gear from both the San Francisco Giant and the Texas Rangers for the world premiere of the acoustic version of his Never Say Never song.

That's because it's slated to air during the pre-show (6:30 p.m. ET) for Game Three of the World Series Saturday on Fox. The game marks the earliest start time of a World Series game in 23 years, according to the MLB.

Bieber's performance