Gerardo Carrillo made his big-league debut in 2026, making 13 appearances out of the bullpen for the Arizona Diamondbacks.

The 28-year-old went 3-1 with a 4.15 ERA and 1.73 WHIP, both of which are a bit high for a reliever.

He allowed 16 walks in 17.1 innings, so that's certainly an issue, but there's a lot to love about what the right-handed pitcher brings to the table.

Carrillo came to Arizona on a minor-league contract in '26, and according to MLB.com's Steve Gilbert, he's expected to be a huge part of this bullpen in 2027, and potentially beyond.

With a lot of turnover expected, Carrillo will have the full offseason to work on his control, command, and everything in between.

Knowing it was his rookie season, there was a lot to love out of the Mexico native.

Carrillo made his debut on July 22 in a two-inning appearance where he allowed one earned run off three hits.

After that, he went 14.1 innings without allowing a run. His streak of nine consecutive scoreless appearances took this organization by storm as he struck out 18 batters in that stretch.

Carrillo picked up a win in his third career appearance, and he actually went on to win back-to-back games on July 28 and Aug. 1.

His season ended with a brutal six earned runs allowed while only recording one out, but basically everything from July 22-Aug. 29 was a smashing success.

Carrillo had a 0.55 ERA through Aug. 28, and the D-backs consistently asked him to go out there and record more than just three outs.

These inning-eating relievers are a huge part of every team, no matter the score. That said, over half of his appearances (seven) were in games decided by two runs or fewer.

There are still a ton of things this Diamondbacks team needs to figure out with its bullpen, but there's no reason not to bring Carrillo back in '27.

He has a five-pitch arsenal, relying no his cutter (29.1%), split-finger (25.6%), and sinker (21.5%) far more than either his sweeper (13.0%) or four-seamer (10.8%).

According to Baseball Savant, his fastball velocity (96.9 mph) is good for the 87th percentile, and that's by far his best advanced metric.

Carrillo's fastball could help take him to the next level, and a few months off before a potential return next season is exactly what he needs to digest his first year in the big leagues.