Diamondbacks' Cristian Mena to undergo shoulder surgery, ending 2026 season

Diamondbacks right-hander Cristian Mena is expected to undergo shoulder surgery, manager Torey Lovullo announced Monday, per Jesse Borek of MLB.com — a development that would end his 2026 season before it ever truly began.

What happened

Per the report, Mena has been on the injured list since the start of this season, carrying forward a teres major strain he first suffered last June that shelved him for the remainder of that campaign. He aggravated the injury over the winter, and a throwing program he attempted at the end of April apparently did not resolve the discomfort. With all other options exhausted, per the report, surgery is the next step.

The practical consequence is that Mena will spend the entire 2026 season on the 60-day injured list. Under general league roster mechanics, placement on the 60-day IL removes a player from the 40-man roster count, which gives Arizona some administrative breathing room — but it also sets up a decision the club will face at the start of the offseason: per the report, Arizona will need to either reinstate Mena onto the 40-man roster or place him on waivers when the season concludes.

Why it matters

The simplest way to frame the stakes here is in time. Per the report, Mena will go nearly two full years without making an appearance by the time this season ends. That is a long stretch of silence for a pitcher who had been regarded as one of the more interesting arms in the organization.

Per the report, Mena was a relatively low-profile international signee by the White Sox out of the Dominican Republic in 2019, and he worked his way up the minor-league ladder quickly enough to become a name worth tracking. He arrived in the Arizona organization carrying the kind of projection that makes a front office patient through setbacks. Two years of setbacks, though, tests any front office's patience, and the surgery announcement means that patience will be tested at least a little longer.

The 60-day IL placement is not merely a bookkeeping formality. Under general league rules, a player on the 60-day IL does not count against the 40-man roster, which matters when a club is managing depth across a full season. But the offseason decision — reinstate or waive — is a real one, and it will arrive with more information about Mena's recovery timeline than exists right now.

Where the club stands

The Diamondbacks enter this week at 86-76 (.531), sitting third in the NL West, 14 games back in the division, and 2.0 games relative to the Wild Card cut line — ranked fourth in that race. They have lost their last two games, and per the standings, Arizona has been eliminated from both the division race and the Wild Card race.

That context matters for how the club weighs every roster decision from here through the end of the regular season. A team still chasing a postseason berth treats a 60-day IL move differently than one playing out the string, and the Diamondbacks are firmly in the latter category.

Mena's absence does not change the rotation picture for this week or any week this season; he was already on the injured list and not part of the active mix. What the surgery announcement changes is the longer-term calculus: the offseason roster decision is now a known item on the to-do list, and the recovery clock, whatever it turns out to be, starts from the operating table rather than from a throwing program.

Heading into this week, Arizona hosts the Los Angeles Dodgers for three games at Chase Field. Michael Soroka is lined up against Eric Lauer on Tuesday, Zac Gallen draws Shohei Ohtani on Wednesday, and Ryne Nelson is scheduled against Justin Wrobleski on Thursday. It is, to put it gently, a schedule that does not offer much margin for error — though the standings suggest the margin question is largely academic at this point.

What we don't know yet

The report does not specify a recovery timetable beyond the implication that the 2026 season is effectively over for Mena. The nature of the surgical procedure is not detailed beyond the shoulder designation. It is also not yet known how the club will handle the offseason roster decision — reinstatement to the 40-man or placement on waivers — as that determination presumably depends on where Mena's recovery stands when the season ends.

What the report does make clear is that the throwing program attempted at the end of April did not produce the results needed to avoid surgery, and that the club reached this decision after, per the report, exhausting all other options. The framing suggests this was not a quick call.

What to watch

The offseason roster decision is the next concrete checkpoint. Under general league mechanics, a player on the 60-day IL must be reinstated to the 40-man roster or placed on waivers at the start of the offseason — Arizona cannot simply leave him in roster limbo indefinitely. How the club handles that moment will signal how it views Mena's trajectory and his place in the organization's plans going forward.

In the nearer term, the Dodgers series at Chase Field offers a window into where this Arizona club is headed as the season winds down. Gallen versus Ohtani on Wednesday is the kind of matchup that draws attention regardless of standings, and the rotation as a whole will be worth watching as the club navigates the final stretch of a season that has already been decided in the standings.

For Mena, the watch item is simpler and longer: recovery, a return to a throwing program at some future date, and eventually — if the surgery goes as hoped — a chance to pitch in a major-league game for the first time in nearly two years.