# Regression Watch: Sept. 6, 2026
The Tigers have been 11.5 points worse than their underlying numbers suggest they should be. The Rays have been 8.8 points better. One of those teams is in the wild card conversation. The other is wondering what happened. The standings know the difference, but the data says they shouldn't.
Welcome to the weekly luckscore audit, where we compare what MLB teams have actually earned against what the run environment, sequencing, and expected metrics say they deserved. Six teams are flashing signals that the market may not have fully absorbed.
Due a Correction
Detroit Tigers (Luck Index: -62, xPoints gap: -11.5) - No team in baseball is running worse right now. Detroit's -62 on the sports luck index is the most extreme negative reading in either league, driven by an ugly combination of one-run losses, stranded baserunners, and bullpen timing that has bordered on theatrical. Their run differential tells the story of a team that should be hovering several games closer to .500. Lines on the Tigers have reflected their record, not their production, and variance this extreme typically does not survive a full month.
San Francisco Giants (Luck Index: -60, xPoints gap: -5.0) - The Giants are nearly as unlucky as Detroit by index but with a smaller points gap, which suggests their underlying quality is lower but still meaningfully better than results indicate. San Francisco has been particularly snakebitten in high-leverage plate appearances, converting at a rate well below league average despite solid contact quality. Markets pricing the Giants as if they are who their record says they are may be underestimating a correction that, historically, tends to arrive.
Los Angeles Angels (Luck Index: -46, xPoints gap: -9.0) - A nine-point expected gap on a team already priced as a below-average club is significant. The Angels' pitching staff has posted peripheral numbers that deserve better results, and their BABIP-against suggests some mean reversion is coming whether the roster earns it or not. Bookmakers tend to anchor on recent outcomes, which means the adjustment window can be slow.
Sometimes the cruelest thing about baseball is that the math remembers what the scoreboard forgot.
Living on Borrowed Luck
Tampa Bay Rays (Luck Index: 73, xPoints gap: +8.8) - The highest mlb luck index reading in baseball belongs to a franchise that has made an art form out of organizational efficiency. But even the Rays are not immune to sequencing fortune. Their bullpen has posted an almost comically low ERA in high-leverage spots relative to expected ERA, and their record in one-run games sits far above the long-term league average. The market has priced Tampa as a legitimate contender. The data says some of that pricing is built on sand.
Arizona Diamondbacks (Luck Index: 48, xPoints gap: +3.7) - Arizona's gap is the smallest among the overperformers here, which makes them the most likely to sustain their current position. Still, a +48 index reading means the D-backs have benefited from enough fortunate sequencing that a modest pullback is probable rather than possible.
Cincinnati Reds (Luck Index: 46, xPoints gap: +7.9) - Nearly eight points of overperformance is a lot of house money. Cincinnati's offense has delivered in the clutch at a rate that outstrips both their season-long OPS and their expected wOBA, which is typically the first thing to normalize. The Reds' line movement over the next few weeks will be worth watching closely.
The Regression Window
In MLB, luck-driven gaps of this magnitude tend to close over roughly 20 to 40 games, which means the September stretch and early October are prime regression territory. That does not mean every unlucky team will surge or every lucky team will collapse. It means the underlying rates, clutch BABIP, bullpen sequencing, one-run game records, tend to normalize, and the standings start catching up to the run environment.
The data does not care about narratives. It just keeps counting.