MLB Daily DeltaWeek 19 · August 3, 2026
week 19
this weekBUY-LOW
last weekBUY-LOW

Michael Rucker

SEA·P
data as of August 3, 2026·week 19
Buy Low fastball velocity stable and above league, the arm is fine — luck-free xERA 3.46 sits 0.64 below league, a real arm the ERA is hiding; BABIP-against 0.321 elevated and unstable, bloating the ERA; buy the player, not the number.high 0.87
ROSK 17ERA 3.70WHIP 1.24W 0–0SV 0

Rucker is a buy-low — his ERA is inflated by bad luck

Michael Rucker's 4.36 ERA doesn't match the arm that's actually showing up. The real skill is his expected ERA of 3.46 — nearly a full run below the league's 4.10 — and while that sample is still stabilizing, the components behind it are not. He's striking out 27.3% of batters, chasing 35.3% of pitches outside the zone, and getting swinging strikes at 13.2%, all well above league. His fastball has been sitting at 96.0 mph, two ticks above average, and it's been climbing through the sample. The reason the ERA is bloated is BABIP-against at .321, 26 points above the league norm. That gap is luck — he's given up 57 balls in play, far short of the 800 needed to trust it. No, the ERA will not stay this high once the bounces even out. He's a good arm with a bad number on the scoreboard. Buy low. Projected 17 K with a 3.70 ERA and 1.24 WHIP makes this a deep-league hold; buy the dip if you need strikeouts.

VS His Norm

  • Strikeout %27.3%—+4.4% ▲vs his ~22.9% career norm

Drivers

  • xeraNOISEluck-free xERA 3.46 sits 0.64 below league — a real arm the ERA is hiding
  • babip_againstNOISEBABIP-against 0.321 elevated and unstable — bloating the ERA
  • p_fastball_veloSIGNALfastball velocity stable and above league — the arm is fine
metric · nowrolling trajectoryvs. leaguestabilized?
Hard-Hit % Allowed38.6%
38.6%*
lg avg 40.0% ▼−1.4%vs his norm —
57 / 50 BBE
Barrel % Allowed7.0%
7.0%*
lg avg 8.0% ▼−1.0%vs his norm —Barrel % Allowed is below the ~8.0% league average — expect it to rise.
57 / 60 BBE
xwOBA Allowed.289
.289*
lg avg .315 ▼−.026vs his norm —xwOBA Allowed is below the ~.315 league average — expect it to rise.
88 / 200 TBF
xERA3.46
3.46*
lg avg 4.10 ▼−0.64vs his norm —xERA is below the ~4.10 league average — expect it to rise.
88 / 200 TBF
ERA4.36
4.36*
lg avg 4.10 ▲+0.26vs his norm —ERA is above the ~4.10 league average — expect it to fall.
20.7 / 200 IP
Strikeout %27.3%
norm27.3%*
lg avg 22.0% ▲+5.3%vs his norm +4.4% ▲
88 / 70 TBF
Walk %6.8%
norm6.8%*
lg avg 8.0% ▼−1.2%vs his norm −2.5% ▼Walk % is below his ~9.3% norm — expect it to rise.
88 / 170 TBF
BABIP Against.321
.321*
lg avg .295 ▲+.026vs his norm —BABIP Against is above the ~.295 league average — expect it to fall.
57 / 800 BIP
Swinging-Strike %13.2%
13.2%*
lg avg 11.0% ▲+2.2%vs his norm —
88 / 60 TBF
Chase %35.3%
35.3%*
lg avg 28.5% ▲+6.8%vs his norm —
88 / 60 TBF
Fastball Velo96.0 mph
96.0 mph*
lg avg 94.0 mph ▲+2.0 mphvs his norm —
340 / 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% 27.3%→24.2%signal17 K — K% 27.3% (signal) tempered to career ~22.9% → projected 24.2% over ~13 remaining…
xERA 3.46noise3.70 ERA — xERA 3.46 (noise) blended 0% skill / 100% league 3.70 at 2 IP.
BB% 6.8% + contactnoise1.24 WHIP — a 7% walk rate plus BABIP-against 0.297 gives a 1.20 skill WHIP, blended 0%…
run support + role0-0 W — wins ride run support and how deep he goes, not just skill.
role (middle)0 SV — role: middle, not in the save mix.
rosterdeep3.70 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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