9. Adam Brett Walker OF: Another outfielder, Walker may be the Twins biggest power threat when it comes to prospects. In 2014, he hit 25 home runs for the Miracle, and has been known to launch some absolute monster home runs. Walker has struggled to stay consistent, and he is often caught having bad at bats. At 23 though, this season is a big one for him. If he is going to figure into the Twins long term plans, Walker will need to show improvement that can push him to Double and Triple-A and have him compete at the big league level.