Joey Gallo, Rangers
Credit: Tom Priddy / Four Seam Images / AP

Joey Gallo is nowhere close to breaking into the big leagues and may never make it, but he's on this list because he's the best batting-practice show in the minors. Gallo hit 40 homers last season while playing Class-A ball for the Spokane Indians and 22 the year before with the Arizona Leage Rangers. He's only 20, having been drafted out of high school in Las Vegas, so his future is far from written. Still, he's worth watching if only because he might surprise you with a 450-foot moonshot.