Rosin, whom the Dodgers selected in the Rule 5 draft pick in December, faced seven Arizona Diamondbacks batters and struck out five. After the game, Rosin sounded like a kid who had just faced major-league hitters for the first time. He didn’t hide the truth.
“It was really fun to pitch against guys like (Paul) Goldschmidt, A.J. Pollock,” he said. “You see them on TV. You always wonder, ‘what would I do if I could pitch against them?’ It was a lot of fun.”
The experience wasn’t as fun for Goldschmidt and Pollock, both of whom struck out in their only at-bat against Rosin. Dodgers manager Don Mattingly called it a “good first impression.”
Rosin gets by on three pitches: A fastball that tops out in the low-to-mid 90-mph range, a slider and a changeup. He said the changeup did most of the damage Wednesday.
The performance was more remarkable when you consider that Rosin’s mechanics are still a work in progress. The Dodgers’ coaching staff, including bullpen coach Chuck Crim, has suggested some tweaks — mostly focused on Rosin’s lower body — designed to add a couple more ticks on the radar gun.
Rosin threw entirely out of the stretch. His condensed windup was deliberate nearly to the point of being awkward, almost a less exaggerated version of former Angels reliever Ben Weber (right).
Rosin described his mechanics Wednesday as a mixture of old and new.
“It wasn’t fully incorporated, what I’ve been doing in the dry work, but it’s a process,” he said. “I wasn’t going to go out there and try something totally new in front of the coaches my first time out there. Hopefully by the last couple games in spring training it’s going to be 100 percent there and everything’s going to be like I want it to be.”
For Rosin to make the Dodgers, he’ll need to string together more performances like Wednesday’s. Even then, he might need an injury or two to befall one of the right-handed middle relievers ahead of him on the depth chart — Brian Wilson, Chris Perez, Brandon League, Chris Withrow, Jamey Wright, Jose Dominguez and Javy Guerra.
If Rosin isn’t on the 25-man roster to begin the season, Rule 5 dictates that he must be designated for assignment and placed on waivers, where any of the other 29 teams can claim him.