Luis De León didn’t exactly arrive in the Orioles’ system with much fanfare. Signed out of the Dominican Republic in December 2021 for a $30,000 bonus, he was the kind of arm teams hope they can develop patiently: plenty of strikeouts, too many walks, and a long road ahead. After a rough start in the Dominican Summer League as a 19-year-old, he climbed slowly through the minors and finished 2025 with three appearances for Double-A Baysox.
The next season was supposed to be a step forward, and in some ways it was - just not in the role anyone likely imagined. De León returned to Double-A in 2026 and made 19 starts, but the results were ugly.
Now 23, he missed bats at a strong clip, striking out nearly 30% of hitters, yet he also walked more than 11%. The ground-ball numbers were useful, but too many runners kept reaching base.
Even with those issues, the Orioles pushed him to Triple-A Norfolk on August 1. He made three starts there before the organization moved him to the bullpen, a shift that fit both the club’s need and De León’s profile.
He had not looked like a pitcher ready to jump the line in Baltimore’s rotation picture, and his hard slider and strikeout ability made him a logical relief option. After just four bullpen outings in Norfolk, he was summoned to the majors.
The first taste of big-league life was rough. De León was thrown into a high-leverage spot in his debut, allowed a home run, and took the loss.
His second MLB appearance ended the same way, and after Yennier Cano let his inherited runner score, De León was charged with another defeat. At that point, it would have been easy to think he needed more seasoning back in the minors.
Then he settled in. Over his final six outings of the year, De León allowed four hits and two walks and did not give up another run.
The sample was tiny, but it was enough to make him look like a real major league arm rather than just a temporary patch. For a frustrating finish to the season, his late stretch stood out.
The big question now is what comes next. The Orioles could still give him another look as a starter, perhaps with a longer run at Norfolk, but his best path appears to be in relief.
He has struggled repeatedly as a starter in the minors, and a hard-throwing left-hander with a slider is the sort of weapon that can matter in a bullpen. In the majors, his fastball ticked up by about a mile per hour once he moved to relief.
The raw stuff is there. The issue has always been whether he can live in the strike zone.
In his 10 MLB games, he did that well enough, though 9.1 innings is hardly enough to lock in any conclusions. If you start digging deeper, the strikeout rate was only half of what he posted in the minors, which is its own warning sign.
Still, it was a promising introduction to the next stage of his career, and he should get a chance to compete for a roster spot in spring training.
De León was once the top-ranked pitcher in the Orioles’ system before the organization’s recent wave of talent changed the landscape. FanGraphs had him as the club’s third-best prospect overall in May, noting that he carried “command-related relief risk” and that his delivery made hitters uncomfortable. They also pointed to the traits that keep him interesting: he can maintain big velocity over a lot of innings, and his secondary pitches - especially his splitter - can finish at-bats.
MLB Pipeline ranked him as the No. 8 prospect in 2026 and echoed the same theme. His command has been inconsistent, and his mechanics can drift.
But when he’s repeating his delivery and staying on top of his release, his stuff plays up, and his walk rate has improved each season as he’s matured. If he can keep throwing strikes, Pipeline said, his arsenal gives him the ceiling of a mid-rotation starter - with the kind of raw stuff that could help a big league bullpen even sooner.
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