"The ball hit him below the elbow, and it just stiffened up on him," Redmond said. "He's fine ... but being a young guy, we didn't want to jeopardize him."
The injury occurred in the first inning when DeSclafani deflected Brandon Moss' infield single off his throwing arm with one out. The single from Moss, the fourth batter of the game, loaded the bases.
Redmond and a trainer came to check on him, but after a few warmup pitches, the right-hander was allowed to finish the inning. DeSclafani remained in the game through the third frame. After facing seven batters and giving up two runs in the first inning, he settled down to retire six of the next seven batters he faced.
DeSclafani said he would have continued to pitch because the bruise didn't bother him. He expects to be well enough to throw on Saturday.
"I still had a sweat going and a lot of adrenaline," he said. "I felt like I wasn't affected by it at all, but it's their judgment, their decision to take me out. I'm not going to argue with that."
Brian Flynn, who was recalled from Triple-A New Orleans to give the bullpen a fresh arm, relieved DeSclafani. He threw three innings and gave up two runs on four hits. He was optioned back to the Zephyrs after the game.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter