MLB Over Under Picks

The MLB run total is the softest main market in American sports. It depends on more independent variables than any other common bet — two starting pitchers, two bullpens, two lineups, a park, a wind forecast and an umpire — and a book pricing fifteen of them before lunch cannot give each the attention it deserves.

That complexity is the opportunity. It is also why a total requires more work per bet than a football side.

Building A Run Projection

The projection is additive, built in layers:

Layer one: the starters. Projected runs allowed over the innings each starter is likely to throw, based on rate statistics rather than ERA. This is typically 55 to 65% of the total.

Layer two: the bullpens. Projected runs over the remaining innings, using each bullpen's quality adjusted for who is actually available. This layer is where the market is loosest.

Layer three: the lineups. Adjust both sides for the lineup actually posted, including handedness matchups against the opposing starter, which can be worth a meaningful fraction of a run when a lineup is stacked favourably or badly.

Layer four: environment. Park multiplier, then wind, temperature and humidity, then the umpire's zone.

Wind Is The Largest Day-To-Day Variable

Baseball's wind effect is directional and park-specific in a way football's is not. Wind blowing out to left field in a park with a short left-field fence is a different adjustment from the same wind speed blowing in, and the same wind in a park with deep fences and high walls barely matters at all.

Roughly: sustained wind blowing out at ten to fifteen miles an hour in a hitter-friendly park is worth something on the order of half a run to a full run on the total. Wind blowing in at the same speed is worth a comparable amount in the other direction. Cold, dense air suppresses carry; hot, humid air increases it.

The timing edge is the same as in football. Forecasts firm up during the day, and total movement lags the forecast. See park factors for how park and wind interact.

Bullpen Fatigue: The Most Underpriced Input

Three or four innings of every game are thrown by relievers, and which relievers are available changes every single day. The market's bullpen adjustment is usually a season-long quality rating, which misses the day-specific reality entirely.

What to look for on an over: a starter with a short recent outing history or a low pitch-count leash, in front of a bullpen that threw heavy innings in the previous two days, with its two best arms unavailable. That situation produces a genuinely higher run environment than the posted total reflects.

The under version is a rested bullpen with multiple high-strikeout arms available behind a starter likely to go seven. This spot is less common because the market prices good bullpens more readily than it prices tired ones.

First Five Innings As A Cleaner Version

If your disagreement with the market is about the starting pitchers rather than the bullpens, the full-game total is the wrong instrument — it introduces three or four innings of bullpen noise into a bet about starters.

The first-five-innings total isolates the part you actually have an opinion on. It costs slightly more in vig at most books and it is worth paying, because the variance reduction more than compensates. Detail on the first five innings page.

Team Totals: The Underused Market

A team total isolates one lineup against one pitching staff, which removes half the uncertainty of a game total. If your read is that a specific lineup is badly matched against a specific starter, the team total expresses that opinion far more precisely than the game total does.

These markets carry lower limits and slightly worse pricing than game totals, and they get correspondingly less market attention, which is exactly why stale numbers survive in them. They are worth checking on any game where your projection disagreement is one-sided rather than about the overall run environment.

Frequently Asked Questions