MLB Daily DeltaWeek 25 · September 10, 2026
Engraved portrait of Brayan Bello
week 25
this weekSELL
last weekSELL

Brayan Bello

BOS·P
data as of September 10, 2026·week 25
Sell stable xERA 5.32 +1.22 vs league with no luck excuse; move on.high 0.90
ROSK 9ERA 4.89WHIP 1.41W 0–1SV 0

Bello is a sell — his expected ERA is a run above league.

His expected ERA is 5.32, a full run above the league average of 4.10, and he has faced enough batters for that number to be reliable. The contact he allows backs it up: a .351 expected wOBA allowed against a league average of .315, on 454 batters faced. Nothing in his profile says this is bad luck. His BABIP-against is not suppressing anything, and his walk rate is right at league average, so there is no excuse to fall back on. The real problem is that he strikes out only 17% of batters — five points below league — so he cannot miss bats and get out of trouble. His xERA has been stepping up across the sample, which makes it worse, not better. Sell. A 9 K / 4.89 ERA ROS line is waiver-wire drag — drop him before the window closes.

VS His Norm

  • Strikeout %17.0%—−2.4% ▼vs his ~19.4% career norm
  • Walk %7.7%—−0.6% ▼vs his ~8.3% career norm

Drivers

  • xeraSIGNALstable xERA 5.32 +1.22 vs league with no luck excuse
metric · nowrolling trajectoryvs. leaguestabilized?
Hard-Hit % Allowed40.9%
40.9%*
lg avg 40.0% ▲+0.9%vs his norm —
335 / 50 BBE
Barrel % Allowed7.8%
7.8%*
lg avg 8.0% ▼−0.2%vs his norm —
335 / 60 BBE
xwOBA Allowed.351
.351*
lg avg .315 ▲+.036vs his norm —
454 / 200 TBF
xERA5.32
5.32*
lg avg 4.10 ▲+1.22vs his norm —
454 / 200 TBF
ERA4.82
4.82*
lg avg 4.10 ▲+0.72vs his norm —ERA is above the ~4.10 league average — expect it to fall.
102.7 / 200 IP
Strikeout %17.0%
norm17.0%*
lg avg 22.0% ▼−5.0%vs his norm −2.4% ▼
454 / 70 TBF
Walk %7.7%
norm7.7%*
lg avg 8.0% ▼−0.3%vs his norm −0.6% ▼
454 / 170 TBF
BABIP Against.319
.319*
lg avg .295 ▲+.024vs his norm —BABIP Against is above the ~.295 league average — expect it to fall.
335 / 800 BIP
Swinging-Strike %11.9%
11.9%*
lg avg 11.0% ▲+0.9%vs his norm —
454 / 60 TBF
Chase %32.5%
32.5%*
lg avg 28.5% ▲+4.0%vs his norm —
454 / 60 TBF
Fastball Velo95.4 mph
95.4 mph*
lg avg 94.0 mph ▲+1.4 mphvs his norm —
1736 / 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% 17.0%→17.7%signal9 K — K% 17.0% (signal) lifted to career ~19.4% → projected 17.7% over ~12 remaining IP.
xERA 5.32signal4.89 ERA — xERA 5.32 (signal) blended 65% skill / 35% league 4.10 at 56 IP.
BB% 7.7% + contactsignal1.41 WHIP — a 8% walk rate plus BABIP-against 0.305 gives a 1.47 skill WHIP, blended 65…
run support + role0-1 W — wins ride run support and how deep he goes, not just skill.
role (starter)0 SV — role: starter, not in the save mix.
rosterdrop9 K ROS, 4.89 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.

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