Best tools in MLB

When talking about prospects, we often hear scouts discuss their "tools": throwing arm, hitting for power, running speed. These are the different elements of a player front offices use to evaluate players, particularly as they prepare for the draft and come up through the minors.

But what about big leaguers? Which pitcher has the best curveball? Who's the best pure hitter? To determine this, we asked Manny Acta, Jim Bowden and Keith Law -- all of whom have worked for MLB clubs in player-evaluation capacities -- to tell us which MLB player possesses the best of each of the traditional tools.