The book on: Byung-Hyun Kim.(Diamondbacks pitcher)(Brief Article)

Byung-Hyun Kim speaks just enough English to politely decline an interview request. But if you road batters' lips as they walk back to the dugout, they'll tell you all you need to know about the 22-year-old's near-underhand delivery.

Entering the week, the Diamondbacks reliever was striking out roughly 13 batters per nine innings.

He's working on a changeup and a sinker. The two pitches would bring Kim's total to four, joining a Frisbee slider and a fastball.

The slider rotates on a vertical axis, which causes it to move more laterally than a normal slider, says Arizona catcher Damian Miller. Kim's rising, 92-mph fastball won't overpower anyone, but it seems about 5 mph faster because of Kim's unusual delivery, Miller says.

Kim could be brutal if he works the two new pitches in and doesn't succumb to confidence problems, as he has in the past. "It's kind of scary to think if he has all four pitches," Miller says.

The changeup hasn't been used much yet, but that's more a function of how Kim is ...