Weekly Waiver Wire Roundup — September 21, 2026

Garrett Mitchell posted a .532 wOBA over the past seven days with a declining strikeout rate and surging walk rate, and he's still available in 84% of leagues. That's the headline, but it's far from the only signal worth chasing this week. Our detection engine flagged 80 rising signals across the waiver wire — a massive week of activity driven by young hitters breaking out, veteran bats finding second winds, and a fascinating concentration of catcher-eligible talent suddenly producing. If you're not paying attention to this week's data, you're falling behind. Let's break it all down.

Top 5 Adds of the Week

Garrett Mitchell (OF, MIL) — 16% Owned (+8% 7d)

Mitchell is the signal of the week, full stop. His .532 wOBA over the past seven days represents a massive jump from his .407 mark over the trailing 30 days, and the process backs it up: his strikeout rate dropped from 28.2% to 26.3%, his walk rate nearly doubled from 6.4% to 10.5%, and he's barreling everything with a 52.5% hard-hit rate and 93.9 mph average exit velocity. The .400 batting average is going to regress, but the plate discipline improvements and quality of contact suggest this isn't a mirage. Ownership surged 8 points this week — the largest gain on the board — but he's still sitting at just 16%. The window is closing fast.

Bryce Eldridge (1B, SF) — 30% Owned (+7% 7d)

Eldridge continues to justify the hype that followed him into the majors. His .384 wOBA this week was supported by elite exit velocity at 94.1 mph and a 43.1% hard-hit rate, and crucially, he logged 28 plate appearances — confirming consistent playing time in San Francisco's lineup. The 1 HR and .292 average over five games is solid but not spectacular on the surface; the exit velocity and wOBA tell you the power is coming. At 30% ownership, he's the most-owned player on this list, meaning the smartest managers have already moved. Don't wait another week.

Cole Carrigg (SS/OF, COL) — 20% Owned (+6% 7d)

Carrigg exploded for 3 home runs this week with a .414 wOBA that dwarfs his .299 mark over the prior 30 days. The dual eligibility at shortstop and outfield adds significant roster flexibility, and his 30 plate appearances confirm he's getting full run in Colorado's lineup. The 56.0% hard-hit rate is genuinely impressive, even if the 90.2 mph exit velocity is merely average. The strikeout rate remains elevated at 30.0%, which is the primary risk here, but it ticked down from 30.3% — not much, but at least trending in the right direction. With Coors Field as his home park and this kind of power output, he's a clear add at 20% ownership.

Christian Koss (2B/3B/SS, SF) — 5% Owned (+5% 7d)

This is the deepest-league gem of the week. Koss posted a .512 wOBA with a .471 batting average over five games, and the signal quality underneath is remarkable: his strikeout rate cratered from 24.8% to 10.0% while his walk rate surged from 6.9% to 15.0%. That's not a hot streak — that's a fundamentally different approach at the plate. The 83.5 mph exit velocity is a legitimate concern and caps his power ceiling, but the contact quality, plate discipline, and triple positional eligibility make him an extremely valuable asset in deeper formats. At 5% ownership, you're essentially getting him for free.

Coby Mayo (1B/3B, BAL) — 25% Owned (+4% 7d)

Mayo rounds out the top five with the most balanced profile of the group. His .412 wOBA is up slightly from .401 over 30 days, suggesting sustainability rather than a spike. The underlying metrics are stellar across the board: 94.3 mph exit velocity, 52.8% hard-hit rate, a strikeout rate holding steady at 22.2%, and a walk rate that jumped from 9.2% to 14.8%. He logged 27 plate appearances this week in Baltimore's potent lineup, and the .304 average with a homer looks like exactly what you'd expect from the statcast data. This is a foundational add — not a lottery ticket.

Biggest Risers in Ownership

The five biggest ownership gainers this week are the same five players featured in our top adds, which tells you the fantasy community is largely reading the signals correctly — just not quickly enough.

Garrett Mitchell led all players with an 8-point ownership surge to 16%, and every point of that gain is justified by the data. You don't often see a player simultaneously improve in wOBA, strikeout rate, walk rate, hard-hit rate, and exit velocity. The only question is whether the playing time holds.

Bryce Eldridge climbed 7 points to 30%, making him the most widely owned player on this list. The 94.1 mph exit velocity alone justifies the add — that's elite-tier raw power translating into game action. The ownership move is completely justified.

Cole Carrigg rose 6 points to 20% on the back of a 3-homer week. Three dingers will do that. The underlying metrics — particularly the 56.0% hard-hit rate — suggest there's more here than just a hot streak, though the 30.0% strikeout rate means expect some cold stretches too.

Christian Koss doubled from approximately 0% to 5%, driven by pure production. The 10.0% strikeout rate over the past week is stunning for a player who struck out at a 24.8% clip over the prior month. Koss is the definition of a breakout signal.

Coby Mayo added 4 points to reach 25%. Of all the risers, Mayo's ownership increase feels the most inevitable — he's been building toward this for weeks, with a .401 wOBA over the trailing 30 days before this week's .412 output. The gains should continue.

Buy Low Candidates

This is where the next wave of adds lives. These players carry a Watch classification — the data is compelling but needs another week of confirmation. If you're in a competitive league, getting ahead of the curve here is how you win.

Elite Statcast, Low Ownership

Emmanuel Rodriguez (OF, MIN) — 2% owned. The statcast data here is absurd: 91.7% hard-hit rate and 102.7 mph average exit velocity. Those are generational-talent-level numbers. His .250 average and .370 wOBA don't fully reflect the quality of contact, which means either he's been unlucky on batted balls or the sample is catching him mid-adjustment. Either way, 102.7 mph EV demands your attention. This is an early signal — just five games — but the underlying quality is impossible to ignore.

Alex Freeland (2B/3B/SS, LAD) — 0% owned. Freeland is a ghost on the waiver wire despite posting a .504 wOBA with a 73.3% hard-hit rate and 95.6 mph exit velocity over 20 plate appearances this week. The triple infield eligibility adds massive value, and a .412 average with a homer suggests the surface stats are catching up to the process. The Dodgers lineup provides one of the best contexts in baseball. This is a priority add in deeper formats.

Henry Davis (C, PIT) — 0% owned. Davis hit only .111 this week, which explains why nobody is picking him up. But look underneath: 98.2 mph exit velocity, 56.2% hard-hit rate, a strikeout rate of just 7.7% (down from 12.1%), and a walk rate of 23.1%. He smacked a homer despite the low average, and the .339 wOBA tells you the plate appearances were far more productive than the batting average suggests. Catcher is thin. Davis is free. The data says add him.

Ethan Salas (C, SD) — 3% owned. Salas posted a .618 wOBA this week — the highest single number on the entire board — with a 95.1 mph exit velocity, 2 home runs, and a strikeout rate that dropped from 33.3% to 22.2%. This is an early signal from just five games, and the 30-day wOBA of .265 reminds you that the cold stretch preceding this week was brutal. But the exit velocity and power suggest the tools are real. At 3% ownership, you can stash him and see if the breakout holds.

Plate Discipline Breakouts

Eduardo Valencia (C/1B, DET) — 2% owned. Valencia didn't strike out once this week — 0.0% K-rate against a 26.0% trailing mark — while hitting .444 with a .457 wOBA. His walk rate jumped from 2.0% to 10.0%, and the 90.3 mph exit velocity is respectable. The catcher eligibility makes this profile especially intriguing in two-catcher leagues.

Juan Brito (1B/2B, CIN) — 1% owned. A 4.8% strikeout rate over 21 plate appearances is elite-level contact ability. Brito hit .429 with a .448 wOBA and a homer, continuing an upward trend from his already-strong .405 wOBA over the trailing 30 days. The 87.8 mph exit velocity caps his ceiling, but in a Reds lineup that generates runs, Brito's bat-to-ball skills could sustain value.

Jordan Lawlar (3B/OF, AZ) — 5% owned. Lawlar's strikeout rate plummeted from 30.4% to 10.5% this week while he hit .353 with a .449 wOBA and a homer. That's a dramatic shift in approach, and while the 87.6 mph exit velocity and relatively low walk rate (5.3%) temper the enthusiasm slightly, the contact improvement over a solid five-game sample is worth monitoring closely.

Power Surge Candidates

Graham Pauley (3B, MIA) — 0% owned. Pauley launched 2 homers with a .546 wOBA, 55.0% hard-hit rate, and 93.7 mph exit velocity. His walk rate rose from 8.6% to 12.5%. This is still an early signal with a small sample, but the combination of power output and plate discipline improvement at zero percent ownership makes him a worthwhile speculative add.

Walker Jenkins (OF, MIN) — 8% owned (cooling -2%). Jenkins' ownership is actually dropping despite a massive week: .375 average, 2 homers, .470 wOBA, 62.5% hard-hit rate, and 94.9 mph exit velocity. His 30-day wOBA of .296 explains the skepticism — the market thinks this is noise. The exit velocity and hard-hit data say otherwise. This is the definition of a buy-low window: ownership declining while the underlying metrics are screaming breakout.

Christian Encarnacion-Strand (1B/3B, BAL) — 9% owned (cooling -2%). Similar to Jenkins, CES is seeing ownership cool off (-2%) despite a monstrous week: .417 average, 2 homers, .512 wOBA, and a strikeout rate that dropped from 30.0% to 24.0%. His 30-day wOBA of .358 was already solid, and 25 plate appearances confirm he's playing every day in Baltimore. Another case where the market is wrong.

Also on the Radar

Angel Genao (2B/3B/SS, CLE) posted a 0.0% strikeout rate with a 75.0% hard-hit rate and 94.4 mph exit velocity — the contact quality is elite even if the .250 average and .314 wOBA are modest. Colt Keith (1B/2B/3B, DET) flashed a 72.9% hard-hit rate with a .370 wOBA and his K-rate dropped from 25.4% to 15.4%. Rafael Flores Jr. (C/1B, PIT) put up a .495 wOBA with a .444 average over 20 plate appearances — the catcher eligibility alone makes him worth a look at 8% ownership. Cole Young (2B, SEA) hit .400 with a .460 wOBA while cutting his strikeout rate in half (10.0% vs 20.6%), and Lars Nootbaar (DH, AZ) quietly posted a .519 wOBA with a 61.7% hard-hit rate and just a 10.5% strikeout rate at only 2% ownership. Tim Tawa (1B/2B/3B/OF, AZ) hit .389 with a .455 wOBA despite cooling ownership, and Anthony Volpe (2B/SS, NYY) is showing signs of life with a 68.3% hard-hit rate and 92.9 mph exit velocity at just 5% ownership.

Position Scarcity Report

The signal distribution this week tells a fascinating story about where the waiver wire is deepest — and where it's a desert.

Relief Pitchers (RP: 11 signals, SP/RP: 6 signals, P: 7 signals) — Pitching dominated the signal count this week with 24 combined pitching signals. The bullpen churn across baseball is creating constant waiver wire opportunities, and managers in leagues that reward holds, saves, and ratios should be actively cycling relievers. Names like Andrés Muñoz, Alex Vesia, Tanner Scott, Mason Miller, and David Bednar all appeared in our signal detection.

Catcher (10 signals) — This is the most remarkable positional story of the week. Ten catcher-eligible players triggered rising signals, including Rafael Flores Jr., Hunter Feduccia, Kyle Teel, Henry Davis, Ethan Salas, Moisés Ballesteros, Eduardo Valencia, and Austin Wells. In a position that's perpetually starved for production, this wave of breakout signals is a gift. If you've been streaming catchers all season, this is the week to lock one in.

Outfield (8 signals) — A solid week for outfield signals, led by Garrett Mitchell and supported by names like Walker Jenkins and Emmanuel Rodriguez. The outfield wire remains relatively deep compared to the infield corners.

Third Base / Corner Infield (3B: 4 signals, 1B: 4 signals, 1B/3B: 3 signals) — Corner infield saw 11 combined signals, with Coby Mayo and Bryce Eldridge leading the way. Multi-position eligible players like Christian Koss (2B/3B/SS) and Tim Tawa (1B/2B/3B/OF) add even more depth here.

Middle Infield (2B/3B/SS: 3 signals, 2B: 2 signals, SS/OF: 2 signals) — The thinnest part of the wire this week. Pure shortstop and second base signals were scarce, with Cole Carrigg and Christian Koss being the primary options. If you need middle infield help, the pickings are slim — act decisively on the available options.

Looking Ahead

Three trends demand your attention heading into next week. First, the catcher position is experiencing an unprecedented wave of breakout signals — ten catcher-eligible players triggered our detection system this week. If even half of these hold, the positional landscape shifts dramatically, and managers who act now will have a significant edge down the stretch. Second, keep a close eye on Emmanuel Rodriguez and his 102.7 mph exit velocity. That number is elite by any standard, and if the results start matching the contact quality, he could become the hottest add of late September. Third, the cluster of ownership-declining players posting elite weeks — Walker Jenkins, Christian Encarnacion-Strand, Tim Tawa — represents the market mispricing recent cold stretches. The underlying data says these players are better than their ownership trends suggest. That's your edge. Use it.