Padres designate Matt Waldron for assignment, reinstate Jeremiah Estrada from IL

The San Diego Padres announced the designation for assignment of right-hander Matt Waldron, with fellow righty Jeremiah Estrada reinstated from the 15-day injured list as the corresponding roster move.

What happened

The Padres announced both transactions simultaneously: Estrada is back on the active roster, and Waldron — a 29-year-old knuckleballer who once carved out a legitimate role in the San Diego rotation — has been designated for assignment. The club announced that Waldron posted a 7.16 ERA across 32.2 innings in 2026, a number that tells most of the story on its own.

Under general league roster rules, a player who has been designated for assignment must be traded, released, or placed on waivers within seven days. Per MLB Trade Rumors, Waldron had already exhausted his final option season entering 2026, meaning he could not simply be sent to Triple-A without first clearing waivers. That out-of-options status had placed him squarely on the roster bubble heading into this season, and the 2026 results did not make the decision a difficult one.

Why it matters

The Waldron arc is one of those quietly melancholy baseball stories that the sport produces with some regularity: a pitcher with a genuinely unusual skill set who looked like he might stick, then didn't. The knuckleball is a rare enough offering that teams tend to give its practitioners a longer leash than a conventional pitcher with similar results might receive, and Waldron benefited from that patience for a while. The patience, ultimately, ran out.

Per MLB Trade Rumors, Waldron's 2023 and 2024 seasons produced 188 innings of work with a 4.79 ERA — not a front-of-the-rotation number, but a functional one. His strikeout rate of 20.6% was below average, which is not unusual for a knuckleballer whose primary weapon is contact management rather than swing-and-miss. His 6.5% walk rate was quite good, and he limited hard contact, which is exactly what you would expect from a pitcher whose entire game is built around making hitters uncomfortable rather than overpowering them.

Then things deteriorated quickly. Per MLB Trade Rumors, Waldron spent most of 2025 in the minors, making only one big league appearance. His Triple-A work was not encouraging — a 6.67 ERA across 18 starts. He entered 2026 out of options, underwent hemorrhoid surgery in February, and opened the season on the injured list. He came off the IL in mid-April, but his first three starts were poor, and the 7.16 ERA across 32.2 innings that followed sealed the outcome.

The operational logic here is straightforward. With Waldron out of options, every day he occupied a roster spot was a day the Padres were committed to carrying him on the active roster or navigating the waiver process. Once the results made the decision clear, the club moved. Estrada's reinstatement from the 15-day IL provided the mechanism.

The numbers

The Padres sit at 91-71 (.562) on the season, good for second place in the NL West — 9 games back in the division race, which the club has been eliminated from. The Wild Card picture is a different matter: San Diego ranks first among Wild Card contenders, sitting +3.0 relative to the cut line, and has won two straight entering Wednesday's home game against the Colorado Rockies.

That Wild Card cushion is meaningful context for a roster decision like this one. A team clinging to a Wild Card spot by a game or two treats every 40-man slot as precious real estate. A team with a +3.0 buffer has slightly more room to absorb the administrative friction of a DFA — the seven-day clock, the waiver process, the possibility of an outright assignment — without it becoming a crisis. The Padres are not in crisis. They are, however, in a stretch of the schedule where bullpen health matters, which makes Estrada's return the more immediately relevant half of this transaction.

Where the club stands

At 91-71, San Diego is a winning baseball team in the middle of a home stand. Wednesday brings Kyle Hart to the mound against Gabriel Hughes and the Rockies at Petco Park. Thursday and Friday feature back-to-back games against the San Francisco Giants, with JP Sears opposing Robbie Ray on Thursday and Bradgley Rodriguez facing Carson Whisenhunt on Friday.

The Giants series will draw more attention than the Rockies opener, given San Francisco's position in the NL West standings. For a Padres club that has been eliminated from the division race but holds a comfortable Wild Card lead, the next week is less about gaining ground than about not losing it — and about keeping the roster functional through the final weeks of the regular season, when the 28-man expansion that kicks in September 1 under general league rules will give clubs additional flexibility.

What we don't know yet

The announcement covers the transaction; it does not resolve what comes next for Waldron. Per general league mechanics, the Padres have seven days from the DFA to trade him, release him, or expose him to waivers. Whether another club claims him, whether he clears waivers and accepts an outright assignment, or whether he is released outright — none of that has been reported.

Estrada's reinstatement is part of the club's announcement, but MLB Trade Rumors does not detail the nature of the injury that placed him on the 15-day IL, the timeline of his recovery, or what his workload looks like coming off the injured list. Those are the kinds of details that tend to emerge over the next few days as a club works a pitcher back into game situations.

What to watch

**Does Waldron clear waivers?**

That is the next procedural question. A 29-year-old knuckleballer with a 7.16 ERA in 2026 and a rough 2025 Triple-A line is not an obvious waiver claim, but the knuckleball's scarcity means there is always some possibility that a club in a different situation — deeper in a rebuild, more willing to absorb a reclamation project — puts in a claim. If he clears, the Padres would have the option of an outright assignment to the minors. If he is released, he enters the market as a free agent. Neither outcome has been reported; the seven-day clock is simply running.

On the Estrada side, the question is how quickly he slots back into a meaningful role. The Padres are in a Wild Card race with a two-game winning streak and a home stand against two NL West opponents. Bullpen availability in late July and August tends to be the variable that separates contenders from also-rans, and a reinstated reliever returning from the 15-day IL is exactly the kind of addition — even if it is technically a subtraction elsewhere on the roster — that a front office in this position is counting on.

The Waldron chapter in San Diego appears to be closing. The knuckleball is a hard pitch to master and a harder career to sustain. He gave the Padres 188 innings across two seasons when they needed them. The 2026 version did not work out, and the roster math made the outcome inevitable once the options were gone.