MLB Daily DeltaWeek 17 · July 18, 2026
Engraved portrait of Mason Montgomery
week 17
this weekBUY-LOW
last weekHOLD

Mason Montgomery

PIT·P
data as of July 18, 2026·week 17
flipped from HOLD on July 18, 2026
Buy Low fastball velocity stable and above league, the arm is fine — luck-free xERA 3.21 sits 0.89 below league, a real arm the ERA is hiding; BABIP-against 0.329 elevated and unstable, bloating the ERA; buy the player, not the number.high 0.88
ROSK 26ERA 3.69WHIP 1.24W 1–1SV 0

Montgomery is a buy-low — his ERA is BABIP noise, not skill.

Montgomery's ERA of 4.13 looks ordinary, but the real story is the 98.2 mph fastball that has been stepping up across the sample. His expected ERA is 3.21, nearly a run lower, and that number is moving toward reliable. The gap is his BABIP-against: .329, 34 points above the league average of .295. BABIP-against needs 800 balls in play to stabilize, and he has 86 — that is pure noise. His strikeout rate is 34.8%, well above league average, and his swinging-strike rate is 15.6%, elite. The skill metrics are loud; the ERA is lying. Buy low. 26 K in a deep league is a buy-low asset — the 3.69 ERA and 1.24 WHIP are carries, not ceilings.

VS His Norm

  • Strikeout %34.8%—+2.7% ▲vs his ~32.1% career norm

Drivers

  • xeraNOISEluck-free xERA 3.21 sits 0.89 below league — a real arm the ERA is hiding
  • babip_againstNOISEBABIP-against 0.329 elevated and unstable — bloating the ERA
  • p_fastball_veloSIGNALfastball velocity stable and above league — the arm is fine
metric · nowrolling trajectoryvs. leaguestabilized?
Hard-Hit % Allowed40.7%
40.7%*
lg avg 40.0% ▲+0.7%vs his norm —
86 / 50 BBE
Barrel % Allowed9.3%
believable since Jun 79.3%*
lg avg 8.0% ▲+1.3%vs his norm —
86 / 60 BBE
xwOBA Allowed.280
.280*
lg avg .315 ▼−.035vs his norm —xwOBA Allowed is below the ~.315 league average — expect it to rise.
158 / 200 TBF
xERA3.21
3.21*
lg avg 4.10 ▼−0.89vs his norm —xERA is below the ~4.10 league average — expect it to rise.
158 / 200 TBF
ERA4.13
4.13*
lg avg 4.10 ▲+0.03vs his norm —ERA is above the ~4.10 league average — expect it to fall.
37 / 200 IP
Strikeout %34.8%
norm34.8%*
lg avg 22.0% ▲+12.8%vs his norm +2.7% ▲
158 / 70 TBF
Walk %10.8%
norm10.8%*
lg avg 8.0% ▲+2.8%vs his norm −1.4% ▼Walk % is below his ~12.2% norm — expect it to rise.
158 / 170 TBF
BABIP Against.329
.329*
lg avg .295 ▲+.034vs his norm —BABIP Against is above the ~.295 league average — expect it to fall.
86 / 800 BIP
Swinging-Strike %15.6%
15.6%*
lg avg 11.0% ▲+4.6%vs his norm —
158 / 60 TBF
Chase %31.1%
31.1%*
lg avg 28.5% ▲+2.6%vs his norm —
158 / 60 TBF
Fastball Velo98.2 mph
98.2 mph*
lg avg 94.0 mph ▲+4.2 mphvs his norm —
665 / 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% 34.8%→33.3%signal26 K — K% 34.8% (signal) tempered to career ~32.1% → projected 33.3% over ~21 remaining…
xERA 3.21noise3.69 ERA — xERA 3.21 (noise) blended 3% skill / 97% league 3.70 at 23 IP.
BB% 10.8% + contactnoise1.24 WHIP — a 11% walk rate plus BABIP-against 0.299 gives a 1.24 skill WHIP, blended 3…
run support + role1-1 W — wins ride run support and how deep he goes, not just skill.
role (setup)0 SV — role: setup, not in the save mix.
rosterdeep3.69 ERA, 1.24 WHIP

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.

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