Corcino, 23, struggled at Triple-A Louisville, going 7-14 with a 5.86 ERA in 28 games, including 23 starts. He walked 73 and struck out 90 in 129 innings.
"It was a step back last year for Daniel Corcino," Reds manager Bryan Price said. "But I don't think he was ever right. He turned it around in the second half a bit. When he was with us [last spring], his arm slot was low. His stuff was flat. His velocity on both his fastball and slider dropped down. His command kind of fell by the wayside."
During the early days of camp, Price has seen marked improvement. Corcino's velocity, command and confidence seem to have returned.
"This spring, he has been one of the many bright spots," Price said. "He would be that comeback player of the year if he throws like he is now. He would have a dynamite year. He's going to be a guy that would quickly put himself into position to be toward the top of the list of guys that could help us this year."