Is Mitch Keller a buy or sell for fantasy baseball?

Sell — metrics are consistently below average with signal behind the decline.

What is Mitch Keller's rest-of-season outlook?

xERA 5.46 with a 17.7% strikeout rate — empty tank.

week 25

this weekSELL

last weekSELL-HIGH

Mitch Keller

PIT·P

data as of September 10, 2026·week 25

ON THE 60-DAY IL

flipped from SELL-HIGH

Sell stable xERA 5.46 +1.36 vs league with no luck excuse; move on.high 0.90

ROSK 10ERA 4.98WHIP 1.38W 1–1SV 0

Keller is a sell — the skill is below league and nothing is masking it.

His expected ERA is 5.46, a run and a third above the league average of 4.10, and he has faced enough batters for that number to be reliable. The track record backs it: that expected ERA has been climbing as the sample has grown, not correcting toward the mean. His expected wOBA allowed is .355 against a league average of .315, so the contact he gives up is genuinely worse than the league's. He strikes out just 17.7% of batters, well below the 22% league mark, and his swinging-strike rate of 9.7% is below average too. His walk rate of 8.3% is right at league. There is no suppressed BABIP-against to blame and no bad luck to give back. Sell. 10 K and a 4.98 ERA ROS — nothing but a drag, so make him a drop.

VS His Norm

Strikeout %17.7%—−4.0% ▼vs his ~21.7% career norm
Walk %8.3%—+0.5% ▲vs his ~7.8% career norm

Drivers

xeraSIGNALstable xERA 5.46 +1.36 vs league with no luck excuse

metric · nowrolling trajectoryvs. leaguestabilized?

Hard-Hit % Allowed42.3%

lg avg 40.0% ▲+2.3%vs his norm —

364 / 50 BBE

Barrel % Allowed7.4%

lg avg 8.0% ▼−0.6%vs his norm —

364 / 60 BBE

xwOBA Allowed.355

lg avg .315 ▲+.040vs his norm —

503 / 200 TBF

xERA5.46

lg avg 4.10 ▲+1.36vs his norm —

503 / 200 TBF

ERA5.29

lg avg 4.10 ▲+1.19vs his norm —ERA is above the ~4.10 league average — expect it to fall.

115.7 / 200 IP

Strikeout %17.7%

lg avg 22.0% ▼−4.3%vs his norm −4.0% ▼

503 / 70 TBF

Walk %8.3%

lg avg 8.0% ▲+0.3%vs his norm +0.5% ▲

503 / 170 TBF

BABIP Against.292

lg avg .295 ▼−.003vs his norm —BABIP Against is below the ~.295 league average — expect it to rise.

364 / 800 BIP

Swinging-Strike %9.7%

lg avg 11.0% ▼−1.3%vs his norm —

503 / 60 TBF

Chase %29.4%

lg avg 28.5% ▲+0.9%vs his norm —

503 / 60 TBF

Fastball Velo93.3 mph

lg avg 94.0 mph ▼−0.7 mphvs his norm —

1887 / 50 PITCHES

5×5 ROS Outlook

rest of season

Where each category goes the rest of the way, and the skill that drives it. Tap a row to expand the full derivation.

statytdrosdriverconf

K% 17.7%→18.8%signal10 K — K% 17.7% (signal) lifted to career ~21.7% → projected 18.8% over ~13 remaining IP.

xERA 5.46signal4.98 ERA — xERA 5.46 (signal) blended 65% skill / 35% league 4.10 at 68 IP.

BB% 8.3% + contactsignal1.38 WHIP — a 8% walk rate plus BABIP-against 0.294 gives a 1.42 skill WHIP, blended 65…

run support + role1-1 W — wins ride run support and how deep he goes, not just skill.

role (starter)0 SV — role: starter, not in the save mix.

rosterdrop10 K ROS, 4.98 ERA

Every projection traces to a sabermetric input. The driver and confidence shown per row are always visible; tap any row to expand the full derivation.

VS His Norm

Drivers

5×5 ROS Outlook

Comparisons