Stealing second base dating
Though he is just now getting his feet wet in the majors, Spangenberg was drafted out of college, and he's already 24 years old.
He doesn't have as much upside as some others on this list.
Baseball is a tough sport to predict on a day-in and day-out basis, and it becomes exponentially more difficult to predict looking years into the future.
But that's exactly what we're going to be doing here.
Drafted as a high school shortstop, Romero immediately slid over to second base as a pro, and he's steadily progressed into an average defender at the position.
He stole 10 bases last season and has average speed, but don't expect him to be much of a base stealer when he does finally reach the majors.
He's off to a sluggish start this season at the High-A level, but in terms of offensive potential, he stacks up to any second base prospect in the league right now. 2 hitter, as he's tough to strike out (13.1 percent career strikeout rate), gets on base at a good clip and should see some of those doubles turn into home runs as he continues to develop.
However, there's still plenty of value in a second baseman who's capable of batting .280 with 30 doubles and 10 home runs.
Gennett has been slightly below average defensively during his time in the big leagues, with minus six defensive runs saved (DRS) and a minus-0.5 ultimate zone rating per 150 games (UZR/150), but he's in no way a liability with the glove.
He's still adjusting to life in the majors, and his early struggles this season earned him a demotion.
But it's important to remember he's still really young.