Nationals claim knuckleballer Matt Waldron off waivers from Blue Jays

The Nationals announced the waiver claim of right-hander Matt Waldron from the Blue Jays — the knuckleballer's second change of address via the waiver wire in under a month. To open a roster spot, Washington transferred pitcher Connelly Early from the 15-day IL to the 60-day IL, a move that removes Early from the 40-man roster count without releasing him outright.

For Waldron, the transaction completes a brisk tour of the National League West and the American League East before landing him in the NL East. The waiver wire has been unusually hospitable to him lately, if not especially restful.

What happened

The Nationals announced that Washington claimed Waldron off waivers from Toronto. The sequence that brought him here began in late July, when San Diego designated him for assignment. The Blue Jays claimed him roughly a week after that, and Waldron made four appearances for Toronto before finding himself back in designation territory. Washington stepped in on the next pass through the wire.

The corresponding roster move involved shifting Early to the 60-day IL. Under general league rules, a transfer to the 60-day IL removes a player from the 40-man roster count, which is what creates the opening for an incoming waiver claim. The circumstances behind Early's IL status were not detailed in the announcement.

Why it matters

The Nationals announced they need arms to cover innings in the bullpen and rotation — a candid framing that doubles as a job description. A club 18.5 games back of the division lead in late August is not assembling a pennant roster; it is managing innings, developing depth, and evaluating what it has. Waldron, available at waiver-claim cost with no prospect capital required, fits that operational context.

The knuckler is a pitch that tends to generate strong opinions and uneven results, and Waldron's 2026 line has supplied both. But the underlying metrics suggest the ERA headline has been unkind in ways that go beyond the pitch itself — which is precisely the kind of reclamation arithmetic that a fourth-place club can afford to run in August.

The numbers

Waldron has pitched 37 total innings across San Diego and Toronto this season, posting a 7.54 ERA. That number is the one that put him on the waiver wire twice. The one that may have persuaded Washington to claim him is his 4.11 SIERA, a metric that attempts to strip out batted-ball fortune and sequencing noise.

The gap between those two figures has a fairly clear explanation in the underlying data. Waldron has allowed a .361 BABIP — well above the range typically associated with neutral luck — and his strand rate sits at 59.4%, meaning runners on base have scored at an elevated clip. Neither figure is a pitcher's friend, and together they account for a meaningful portion of the distance between a 7.54 ERA and a 4.11 SIERA.

On the positive side of the ledger, Waldron's 5.9% walk rate is genuinely solid, and it looks more impressive when you factor in that he is throwing a knuckler — a pitch that historically invites more free passes than a conventional fastball-slider mix. The limitation is that he is not missing many bats. A knuckleballer who does not walk hitters but also does not strike them out is asking a lot of his defense and his sequencing luck, which is more or less what the BABIP and strand rate are already reflecting.

Where the club stands

Washington is 67-77 (.465), sitting fourth in the NL East, 18.5 games behind the division leader, and on a three-game losing streak heading into the weekend. The Wild Card picture is not much more encouraging: the Nationals rank 9th in the Wild Card standings, 9.0 games relative to the cut line.

The upcoming schedule offers a look at two clubs navigating their own late-season circumstances. Washington plays Saturday and Sunday at Miami's loanDepot park, with Jake Irvin probable against Eury Pérez on Saturday and Jackson Kent probable against Janson Junk on Sunday. The club then returns home Monday to host Colorado at Nationals Park, where Cade Cavalli is probable against Ryan Feltner.

That three-game road trip to Miami, followed by a home series opener against Colorado, is the immediate context in which Waldron joins the organization. Whether he appears in any of those games — and in what role — is the first operational question his claim raises.

What we don't know yet

The announcement did not specify whether Waldron is expected to work out of the bullpen, slot into the rotation, or begin in some kind of transitional role. The Nationals' stated need covers both possibilities, which leaves his deployment genuinely open. Four appearances with Toronto is a thin sample for projecting how a new organization will use him.

The details behind Early's transfer to the 60-day IL were also not addressed. Whether that move reflects the severity of an existing injury, a timeline that extends well into the offseason, or a roster-management decision made easier by the Waldron claim is not established in the announcement.

What to watch

Waldron's first appearance in a Nationals uniform will answer the bullpen-versus-rotation question more quickly than any official statement. A low-leverage relief outing suggests a cautious integration; a spot start would indicate the club is willing to hand him innings in a more structured role right away.

The SIERA-to-ERA gap is also worth tracking. If the .361 BABIP and 59.4% strand rate regress toward more neutral territory — as the SIERA implies they should — the surface results could look meaningfully different over the final weeks of the season. That is not a guarantee, and the desk is not in the business of projecting outcomes, but it is the underlying logic of the claim and the question Washington's front office is implicitly betting on. For a club already outside the playoff picture, the cost of being wrong is low and the potential informational value of the answer is real.