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Are they ready for prime time?

“It sure looks like it,” Martin said. “It’s hard to say that they’re not ready right now. There’s really only one way to find out.”

On Osuna: “He gobbles it up. He understands it.”

Osuna throws two types of fastballs, a changeup and slider, mixing in an occasional cutter. Like Castro, he generally stays cool on the mound, but occasionally tries to do a little too much, Martin said.

“Sometimes he gets in a fastball count, or he gets ahead in the count, and he tries to add a little bit to his fastball [velocity],” Martin said. “I just told him, when he tries to add a bit to his fastball, he ends up leaving it a little bit up in the zone. What I believe is that he should just keep making pitches and not just throw a pitch. When you look at him in the bullpen, he’s got a great feel for all his pitches, so I just want him to keep pitching all the time — never just give in to a hitter, always try to execute a certain pitch …

“I like to have that aggressive nature about him, but I’d just like for him to, when he elevates a pitch, it’s on purpose. And when he’s consistent, I want him to be consistently down in the zone because most of his pitches work well there. His changeup plays off that. If you want somebody to chase your changeup down in the zone, you have to be able to throw your fastball down in the zone because a changeup looks like a fastball for the most part. It’s got that fastball arm action. You’re trying to induce swings, so the best way to do that is to make all pitches look like the same coming out [of the pitcher’s hand]. If he has that downward plane on his fastball, he’s more apt to get swings on changeups that are kind of falling off that plane. That’s what I was telling him. He gobbles it up. He understands it.”