Washington Nationals prospect Alejandro Rosario is back on the mound.
Rosario posted that he was throwing again for the first time in more than 600 days, a notable update for a pitcher whose path since the MacKenzie Gore trade has been anything but straightforward. He was the fifth player in the deal, and the one with the most uncertainty attached to him.
Four of the prospects from that trade have already appeared, with mixed results. Rosario, meanwhile, spent all of last season out after Tommy John Surgery.
That absence only added to the mystery around him. Rosario entered pro ball as a highly regarded arm after a winding college track. He chose Miami over the draft out of high school, then struggled there, putting up an ERA above 7 in both his sophomore and junior years.
Even with that uneven college run, the Rangers took him in the 5th round in 2023 because the upside was obvious. The bet paid off quickly. In his first season as a pro, Rosario tore through the lower minors and put together a 2024 line that got attention across the industry: a 2.24 ERA with 129 strikeouts and just 13 walks in 88.1 innings.
That production helped push him into top 100 prospect territory, and the scouting report backed it up. His fastball sat in the 96-97 range and reached 100.
His splitter, which sat around 90 MPH, became a true wipeout pitch in pro ball. He also mixed in a slider that flashed plus.
The stuff was loud, but the command was part of the appeal too. After walking hitters at Miami, Rosario pounded the strike zone in 2024 and walked fewer than 4% of the batters he faced. The result was a pitcher who simply overmatched minor league lineups.
Then everything stopped. Rosario had not thrown since that season, making him a boom-or-bust name in every sense. Before the 2025 season, he suffered a torn UCL that required Tommy John Surgery, but the operation did not actually happen in 2025.
Why that didn’t happen remains unclear. The details were never fully explained, and there was a stretch where the situation around his surgery was murky even after he had been traded to Washington.
It was reported at one point that he had undergone the procedure in the winter, but that turned out not to be true. He eventually did get the surgery, though.
Now that Rosario is back to throwing, the next chapter finally has some momentum. He’ll be one of the more interesting Nationals storylines to watch heading into next season, and there’s another wrinkle: he is Rule 5 eligible this offseason, so Washington has a decision to make there as well.
There’s no guarantee Rosario gets back to the level he showed in 2024, but if he does, the Nationals may have landed the best player in the Gore package. He’ll turn 25 in January, yet the combination of stuff and command remains rare. Among the minor leaguers in the system, he stands out as one of the most intriguing.
The path forward could take different turns. A bullpen role might make sense at first, simply because he’ll need time to build innings back up. But there’s also a scenario where Rosario follows a Cade Cavalli-like climb and develops into a top-of-the-rotation arm within a couple of years.
For now, though, the big thing is simply that he’s throwing again. After so much uncertainty, that alone is encouraging.
One of the reasons Toboni wanted a volume focused package for Gore was so he can take a gamble on Rosario. The upside is still there, and it remains enormous.
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