Running hot, running cold: who’s due to regress, and who’s due to surge

Every standings page tells you who’s winning. None of them tell you who’s earning it. So we ran our rest-of-season projection with every injured regular put back on the roster — the 200-plus-PA hitters and five-plus-start pitchers restored from the IL — and compared each club’s current winning percentage to what that full-strength roster projects from here forward.

The difference between the two is the whole point. A team playing well above its healthy-roster pace is a regression risk. A team playing below it is an upside case — often with a key arm or bat on the way back. Here are the ten clubs whose record and reality are furthest apart.

At a glance: current vs projected division standing

The pattern is clean. The overachievers tend to slip in the division as the model regresses them; the underachievers tend to climb as healthy rosters take hold. Ranks below are within each team’s division — current rank by win%, projected rank by full-season wins.

These teams are winning more than even their healthy rosters project. The model isn’t calling them bad — it’s calling them unsustainable at this rate.

The best record in baseball is built on the best run prevention in baseball — 3.36 RA/G — and that’s the one number the model doesn’t believe holds. It projects Atlanta’s runs allowed to climb to 4.62, near league average, which alone collapses a +1.61 run differential to roughly even.

Here’s the skepticism: the rotation has been outpitching its talent all year while gutted by injury. Spencer Strider has been hurt and ineffective before landing back on the IL; Spencer Schwellenbach and Hurston Waldrep have battled elbow issues; and the staff has leaned on a 37-year-old Chris Sale and a Bryce Elder breakout sitting well above his career norm. A rotation holding the line on those legs is exactly the kind of run prevention that regresses — which is why Atlanta tops the list even as a genuinely strong club.

An offense-driven climb the model expects to cool. Washington is scoring 5.38 R/G — top-tier production — and the projection drops that nearly a full run to 4.43 while the pitching stays leaky at 5.20 RA/G. The young core of James Wood, CJ Abrams, and company has powered a surprising wild-card push almost entirely with the bats. The problem is the thin rotation behind them: a cooling lineup leaves little to fall back on, and the run differential slides from +0.18 to −1.04. That’s the difference between a .513 team and a .389 pace.

A winning record sitting on a dead-even run differential of +0.03. The Cardinals have won more games than their underlying play supports — the kind of edge in close, late games that rarely sustains. Jordan Walker and Alec Burleson have carried the offense and the bullpen has held tight margins, but a recent stretch of blown leads is the reminder that one-run luck cuts both ways. The model trims the offense slightly and pushes run prevention from 4.53 to 4.84 RA/G, projecting a .459 pace and an 80-win finish from a team that currently looks like a contender.

Already sub-.500, and the model sees worse coming — mostly because of the calendar. Cincinnati faces the hardest remaining schedule in the league (.529 SOS) and carries a −1.14 run differential the projection doesn’t expect to improve. Less a stat collapsing than a fringe roster meeting the toughest road left in baseball: a .398 pace and a 70-win finish.

The most surprising name on the list — and a real story. After back-to-back 100-loss seasons, a young core around Miguel Vargas and Colson Montgomery has Chicago genuinely contending in the AL Central. But the winning record sits on a −0.24 run differential, and the model puts the regression on the pitching side (4.81 → 5.11 RA/G). The offense actually projects up slightly, so this call rests on run prevention normalizing, not the bats fading. A genuinely improved team still running a touch hot.

These teams are losing more than their healthy rosters should — and in most cases, the reinforcements explaining the rebound are already trickling back from the IL.

The largest bounce-back signal in the league, and the math says it’s real. Detroit is 31–44 despite an essentially even run differential of +0.04 — they’ve lost a pile of close games their play didn’t deserve to lose. The rotation held up at a 4.09 ERA even without two-time reigning Cy Young winner Tarik Skubal, who returned in mid-June after May elbow surgery. The part that cratered was the offense (fifth-fewest runs in baseball), carried by Riley Greene and rookie Kevin McGonigle. With Skubal anchoring run prevention and the offense projected to climb from 4.15 to 4.52 R/G, the model flips Detroit to a .523 pace — a near-total reversal of a last-place record.

A last-place record driven almost entirely by a punchless offense — and the model sees it recovering. Boston has played most of the year without young star outfielder Roman Anthony (finger ligament) and ace Garrett Crochet (shoulder/lat since late April). Restoring those pieces is where the recovery comes from: the offense climbs from 3.95 to 4.29 R/G with power leading the way, home runs jumping from 0.85 to 1.05 per game. The caveat is health — both returns have hit setbacks — but the full-strength lens grades this as a roughly average roster buried by injury.

A pitching-health turnaround. Run prevention is normally the Royals’ calling card, but the rotation has been gutted — Cole Ragans and Kris Bubic both battling arm injuries, Seth Lugo dinged up, and slugger Vinnie Pasquantino lost to a hand fracture. The full-strength arm restores a rotation that, when healthy, ranks among the best in baseball, swinging run prevention from 4.83 to 4.20 RA/G and the differential from −0.70 to roughly even. The most health-contingent case of the group — the Ragans timeline is uncertain — but the upside is a .502 pace.

Deeply buried — 16 games back — and hit by a wave of pitching injuries, but the model sees a much better team underneath. Logan Webb anchors the rotation and makes the Giants look like a different club every fifth day, with reinforcements working back from the IL behind him. The projection has both sides improving with health: offense from 4.09 to 4.55 R/G, run prevention from 4.84 to 4.52 RA/G, swinging the differential from −0.75 to even. The improvement is broad-based rather than reliant on a single return — a .488 pace the rest of the way.

A roster built to hit that has badly underperformed at the plate — and the model expects the bats back. Texas has paired strong run prevention with one of the league’s weaker offenses, several established hitters sitting well below career norms. The projection treats that as the regression candidate, pulling the offense from 4.11 to 4.42 R/G and power up from 1.05 to 1.20 HR/G, while the already-good pitching tightens to 3.96 RA/G. A lineup with this much track record rarely stays this quiet — a .547 pace, comfortably the best on this list and a clear step above its current record.