Re: Kevin Goldstein on Hamilton and Arias
Depends on what you mean by hacker, River Rat. Players almost always improve their BB rate as they move into the prime of their careers, then see another slight bump as they enter the twilight.
But those are the players that already have enough plate discipline to make it to 15- and 20-year professional baseball careers. Many, many others flame out early because they cannot tell the difference between sliders and cut fastballs and can't lay off either.
I wouldn't get overly concerned with either BB rate right now, though both are in the danger zone. Still, it's relatively early in both their training level and the short seasons of rookie ball. Two or three weeks of selectivity could see a major imrovement.
Both, IMO, will always be hackers relative to guys like Adam Dunn or Kevin Youklis. Then again, anybody would. If they can get their BB rate around 5-6 percent, they should be okay, relatively speaking. (Though, obviously, you'd want to see it higher.)
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