Miguel Mendez is a Tantalizing (But Incomplete) Depth Arm for the 2026 Padres

[Randy Holt]

The nature of an organization led by a hyper-aggressive executive like A.J. Preller is that, eventually, your farm system looks like it was ransacked by a prospect-hungry Galactus. Such is the state of the San Diego Padres at present. Despite years of building up an impressive minor-league system, Preller has recently emptied the cupboard in a way that's left the Padres at or near the bottom of just about every ranking from any outlet. While we shouldn't discount the front office's ability to build it back up rather quickly, that level of activity has left the upper levels of the organization without much talent capable of impacting the major-league roster in the immediate future. 

That doesn't mean it's completely hopeless, however. 

Prior to this year's 40-man rostering deadline, in which teams had to select players to their roster as means of protection from the Rule 5 Draft that took place earlier this month, Preller and the Padres added pitcher Miguel Mendez to the mix. MLB Pipeline has Mendez currently as the No. 5 prospect in the organization, with his profile noting the following:

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Mendez has ramped up his four-seam fastball to touch 100 mph at times this season, and even when he sits more in the 95-98 mph range, there is still explosive life up in the zone that he’s used to blow past low-level bats. His mid-80s slider plays off that well, breaking late and just in time to fool hitters who were sitting on the heater. Lefties have just as much of a problem with the breaking ball as righties with half-hearted swings once they realize they’ve been fooled. That’s needed because while Mendez has an upper-80s changeup, it’s too firm to do more than simply change speeds.

With the exception of Bradgley Rodriguez — who got a cup of coffee at the top level in 2025 — Mendez is the only prospect listed in the team's top 10 with an ETA even close to 2026. His recent addition to the 40-man, in conjunction with that exciting profile above, combine to create an exciting, if a bit overlooked, arm heading into next season. Of course, even such excitement comes with certain caveats. 

In 2025, Mendez made three starts with Single-A Lake Elsinore, a dozen in High-A Fort Wayne and another six with Double-A San Antonio. In those 21 starts, his ERA checked in at 3.22 (3.86 FIP), with a 29.4 percent strikeout rate and a walk rate just over 11 percent. When you consider the arsenal — an upper-90s fastball with an effective slider and developing changeup — against the results, you can understand why the Padres were concerned about protecting Mendez from selection in the Rule 5 Draft. However, let's circle back to those caveats before assuming we'll see Mendez throwing baseballs at Petco Park early in 2026. 

The first is his free pass habits. Since joining the organization back in 2021, Mendez has pitched to a BB% of 11.3. In each of 2023 and 2024, both with Lake Elsinore, he posted figures of 13.3 and 14.9, respectively. While he was able to improve that in his third time around in his trio of starts this year (8.0), it did increase gradually as he rose through the system. It was at 9.8 with Fort Wayne before leaping to 15.9 in San Antonio. That higher rate with San Antonio is also notable, as it was upon reaching Double-A that Mendez faced his biggest struggle of last season. In addition to the jump in free passes, Mendez's ERA came in above eight with the Missions. While his 5.91 FIP indicated slightly better results, the combination of walks and homers (16.7 percent homer-to-fly-ball ratio) did him in. It's likely he'll get another run against that same competition before he even touches Triple-A El Paso, let alone the top level. 

That doesn't mean Mendez was a total loss the higher he rose in the system, however. His strikeout rate was actually higher with the Missions than with Fort Wayne, and it's fairly clear that he ran into some bad luck with the former (.346 BABIP, 56.1 percent strand rate). It was also a mere 22-ish inning sample against more than 60 in High-A. It's a rather complex stage of development, where you're looking for growth against stronger competition but also have to be aware of the nuances and not take the stats purely at face value. 

Within all of that, it's important to note that the command has improved over his years in the organization. Last year's walk rate is a far cry from the 15.5 percent rate he posted back in 2022 and reflects steady improvement in the two seasons in between. Nevertheless, it's the command that will need to demonstrate continued and sustained improvement before Mendez is considered for a role on the San Diego staff. 

Regardless of that, the young right-hander is a fascinating piece of the puzzle for the Padres in 2026. The upside is undeniable; when you're flashing that kind of heat and an effective secondary pitch, you're going to find your way up the ladder in an expedient fashion. It's a matter of the command and perhaps that changeup emerging as a more effective tertiary offering that may dictate how fast the rise is.

If Mendez can show that both of those things are coming to fruition early on, maybe he gets a look in El Paso. Or, depending on the team's pitching at the major-league level, he jumps a level entirely in order to get working with Ruben Niebla even faster. In any case, with a team that has such little upside at the upper levels at present, Mendez is an essential watch for a Padres staff that will be seeking quality starting pitching in any way they can find it in 2026.

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