Weekly Waiver Wire Roundup — Monday, September 7, 2026

Tristan Peters is the most explosive add in fantasy baseball this week, and it's not particularly close — a .586 wOBA over the last seven days with a 37-percentage-point ownership surge tells you the window is closing fast. Across 80 rising signals detected in the past week, the waiver wire is delivering a September loaded with breakout candidates, buy-low catchers, and late-season lineup reshuffles that demand immediate attention. Here's everything you need to know heading into your FAAB bids.

Top 5 Adds of the Week

Tristan Peters (OF, CWS) — 40% Owned (+37% 7d)

Peters has been the single hottest bat on the waiver wire, slashing .429 with 3 home runs and a staggering .586 wOBA across 24 plate appearances in five games. The underlying process backs up the production: his strikeout rate has dropped to 12.5% from 16.7% over the past 30 days, his walk rate holds steady at 12.5%, and he's posting a 52.1% hard-hit rate with 92.4 mph average exit velocity. The 128 wRC+ confirms he's producing well above league average. At 40% ownership and surging, Peters may already be gone in competitive leagues — but if he's sitting on your wire, this is a priority claim with no caveats.

Lawrence Butler (OF, ATH) — 60% Owned (+11% 7d)

Butler's ownership is the highest on this list at 60%, but the 11-point weekly spike signals that managers are finally buying in on what the data has been suggesting for weeks. His .508 wOBA in the last seven days is a massive jump from his .386 over 30 days, powered by a walk rate that has ballooned to 25.9% from 13.3%. With a 54.1% hard-hit rate and 91.9 mph exit velocity across 27 plate appearances, the quality of contact supports the production. Butler hit .400 with a homer in five games — the plate discipline surge is the real story, and it suggests this heater has staying power.

Coby Mayo (1B/3B, BAL) — 10% Owned (+7% 7d)

Mayo is the kind of September call-up scenario that wins leagues. At just 10% ownership, he cracked 2 home runs in five games with a .300 average and a .406 wOBA that's up from .366 over 30 days. His 50.0% hard-hit rate across 22 plate appearances shows he's squaring up the ball consistently. The dual eligibility at first and third base adds crucial roster flexibility. Baltimore's lineup provides a strong supporting cast for RBI opportunities down the stretch, and at single-digit ownership before this week's bump, Mayo is the highest-upside add among players still widely available.

Pedro Ramírez (2B/3B, CHC) — 8% Owned (+4% 7d)

Ramírez's week was defined by one absurd number: a 0.0% strikeout rate across five games, down from 17.9% over 30 days. That's unsustainable, but it speaks to a hitter who dialed in his approach completely. He paired that contact ability with a 15.4% walk rate (up from 7.7%), a 93.0 mph average exit velocity, and a .395 wOBA. The 1 home run and .273 average may not leap off the page, but the process metrics — elite contact, improved patience, and hard contact — make him a compelling multi-position add at just 8% ownership. In leagues that reward plate discipline, Ramírez is a goldmine right now.

Bryce Eldridge (1B, SF) — 18% Owned (+4% 7d)

Eldridge is putting on a Statcast clinic. His 62.5% hard-hit rate leads all five of this week's top adds, and his 94.7 mph average exit velocity is elite. He hit .429 with a homer and a .484 wOBA across 23 plate appearances in five games. The 30-day wOBA of .359 already showed a productive hitter, but the seven-day spike to .484 suggests Eldridge has found another gear. At 18% ownership with consistent playing time locked in, he's the kind of first baseman who could be a league-winner down the stretch — especially in formats that reward power and hard contact.

Biggest Risers in Ownership

The ownership leaderboard this week tracks closely with the quality of underlying signals, which is a healthy sign — managers are reacting to real production, not just name recognition.

  • Tristan Peters (+37%) — The largest ownership spike of the week is entirely justified. A .586 wOBA, declining strikeouts, and consistent playing time leave nothing to debate. If anything, the rush to add should have started sooner.
  • Lawrence Butler (+11%) — Butler's surge from 49% to 60% reflects a player whose plate discipline transformation is becoming impossible to ignore. A 25.9% walk rate paired with a .508 wOBA is an elite combination. The ownership climb is warranted and likely continues.
  • Coby Mayo (+7%) — A seven-point rise from 3% to 10% barely scratches the surface of where Mayo's ownership should be. Two homers and multi-position eligibility in Baltimore's lineup deserve far more attention.
  • Pedro Ramírez (+4%) — Rising fast from 4% to 8%, Ramírez's ownership still severely lags his production. The 0.0% strikeout rate will regress, but the contact quality (93.0 mph EV) and improved walk rate suggest a real breakout, not a mirage.
  • Bryce Eldridge (+4%) — From 14% to 18%, Eldridge's rise is steady rather than explosive. Given his 62.5% hard-hit rate and 94.7 mph exit velocity, he's arguably the most underowned player on this entire list relative to his Statcast profile.

Buy Low Candidates

These watch-list players have strong underlying metrics that suggest their recent production is sustainable — or that a breakout is imminent. Ownership remains low enough that you can be patient, but don't wait too long.

Catchers Leading the Way

Sean Murphy (C, ATL) is the headliner here — a .542 wOBA, 93.4 mph exit velocity, 54.2% hard-hit rate, and a 29.4% walk rate in the last seven days. At just 3% ownership, Murphy looks like a league-winning add at the game's thinnest position. Two homers and a .333 average in five games back up the underlying quality.

Carson Kelly (C, CHC) has quietly been crushing it: a .477 wOBA with 2 home runs, and his strikeout rate has plummeted to 5.3% from 14.1% over 30 days. The 15.8% walk rate adds to the intrigue. At 10% ownership, he's a premium catcher option hiding in plain sight.

Tyler Stephenson (C, CIN) won't dazzle with a .222 average, but a 93.1 mph exit velocity, 48.0% hard-hit rate, and a declining strikeout rate (28.6% from 35.1%) suggest better days ahead. The 21 plate appearances confirm he's playing regularly. At 16% ownership, he's a solid buy-low target behind the dish.

Austin Wells (C, NYY) hit 2 home runs with a .396 wOBA despite just a .333 average. His 92.0 mph exit velocity and 45.0% hard-hit rate at 5% ownership make him a streaming option worth monitoring weekly.

Gary Sánchez (C/1B, MIL) is the wildest Statcast profile on this list: 100.0% hard-hit rate and 100.2 mph average exit velocity. Yes, that's an early signal on limited batted balls, but the raw power is undeniable. His .483 wOBA and 28.6% walk rate suggest he's being extremely selective. At 1% ownership, he's a speculative add with massive power upside.

Infield Targets

Justin Foscue (1B/2B, TEX) posted a .500 wOBA with 2 home runs, a 58.3% hard-hit rate, and 94.9 mph exit velocity at 0% ownership. That's right — zero percent. The dual eligibility makes him immediately playable. This is the definition of a free pickup with premium underlying data.

J.P. Crawford (3B/SS, SEA) is walking at a 27.6% clip with a .501 wOBA and has cut his strikeout rate from 20.5% to 10.3%. The .474 average across 29 plate appearances is hot, and the playing time is rock solid. At 6% ownership, Crawford's patience-driven profile makes him a reliable points-league asset.

Andrés Chaparro (1B, WSH) is the Statcast darling here: a 71.7% hard-hit rate with 95.1 mph exit velocity, and his strikeout rate is down to 10.5% from 19.2%. The .410 wOBA and improved 15.8% walk rate at 2% ownership make him a premium buy-low at a corner infield spot.

Brady House (3B, WSH) showed improvement at the plate with a strikeout rate dropping from 28.3% to 18.2% and a 96.1 mph exit velocity paired with a 58.3% hard-hit rate. The raw power metrics at 2% ownership make him a worthwhile stash.

Outfield Sleepers

Wade Meckler (OF, LAA) hit .417 with a .443 wOBA across 27 plate appearances while cutting his strikeout rate to 11.1%. At 1% ownership with a 53.1% hard-hit rate and consistent playing time, Meckler is the kind of high-contact outfielder who can quietly carry your batting average for weeks.

Yohandy Morales (1B/3B, WSH) has the most eye-popping raw data on this list: an 83.3% hard-hit rate, 98.6 mph exit velocity, and a .624 wOBA. It's an early signal on just four games, but those are elite-tier Statcast numbers. At 4% ownership, the upside is enormous if the playing time holds.

Lars Nootbaar (DH, AZ) smashed 2 homers with a .481 wOBA, 66.7% hard-hit rate, and 99.3 mph exit velocity. At 2% ownership with consistent playing time (20 PA), Nootbaar's power surge deserves immediate attention in deeper formats.

Jonah Cox (OF, SF) cut his strikeout rate from 35.8% to 23.8% while boosting his walk rate to 14.3% and posting a .462 wOBA with a homer. At 7% ownership, the approach improvements make him worth a speculative add. Meanwhile, his Giants teammate Turner Hill is hitting .450 with a 4.0% strikeout rate and a .457 wOBA at 0% ownership — that's a free pickup with elite contact skills.

Other notable names on the watch list include J.T. Realmuto (.376 wOBA, 2 HR, strikeout rate down to 10.5%), Jonah Heim (58.3% hard-hit rate, .365 wOBA), Angel Martínez (.403 wOBA, 13.6% K rate), Cooper Pratt (.419 wOBA, 5.9% strikeout rate), and A.J. Ewing (.411 wOBA with a 19.0% walk rate). Each offers a distinct profile worth monitoring into next week.

Position Scarcity Report

This week's 80 signals paint a clear picture of where the waiver wire is deepest — and where you need to act before the cupboard is bare.

Relief Pitchers (RP: 14 signals, SP/RP: 6 signals, P: 11 signals) — Pitching dominated the signal count this week with over 30 combined pitching-related signals. Names like Alex Vesia, Josh Hader, Andrés Muñoz, Mason Miller, and Jhoan Duran are all generating activity. If you need saves or ratios for the final push, the bullpen market is unusually active right now. Starters like Chase Burns, Kyle Harrison, and Kodai Senga also triggered signals worth investigating.

Catchers (9 signals) — The catcher position is the week's biggest story on the position player side. Sean Murphy, Tyler Stephenson, Carson Kelly, Austin Wells, Gary Sánchez, Leo Bernal, Brian Serven, Elias Díaz, and J.T. Realmuto all showed positive signals. In a position historically devoid of waiver wire value, nine signals in one week is remarkable. Act now if your catcher spot has been a black hole.

Outfield (10 signals) — Outfield depth remains strong with Peters, Butler, Meckler, Cox, Hill, and others all generating signals. The position is deep enough that you can afford to be selective about profile fit.

First Base (7 signals) and Corner Infield (1B/3B: 3 signals) — First base is well-represented with Eldridge, Mayo, Foscue, Chaparro, and others. Multi-position eligibility from players like Mayo and Mark Vientos adds extra value.

Middle Infield (2B, SS) — This is the thinnest area on the wire. Only a handful of signals came from pure middle infield options — Cooper Pratt at shortstop, Pedro Ramírez at second/third, and Angel Martínez at second/outfield. If you need a middle infielder, Ramírez and Pratt are your best bets, but the pickings are slim.

Looking Ahead

The September roster expansion wave is fully underway, and next week's signals will likely reveal which call-ups are earning sustained playing time versus platoon duty. Keep a close eye on the Washington trio of Yohandy Morales, Brady House, and Andrés Chaparro — all three are flashing elite exit velocity and hard-hit data on small samples that could explode with more at-bats. The catcher position signals are particularly notable; if Sean Murphy and Carson Kelly sustain these contact improvements for another week, they'll graduate from watch-list names to must-add territory. Don't sleep on Justin Foscue at 0% ownership — if Texas keeps him in the lineup, he has top-add potential by this time next week.