Wacha under 17.5 outs is one of the strongest innings-length fades on the April 17 board. The model puts him at 14.56 outs with a 78.21% hit rate to stay under, while the market prices the same side much closer to a coin-flip favorite.
That gap matters because this is not a half-out disagreement. The projection is basically asking Wacha to finish somewhere in the fifth inning on average, while the market still needs him to get through six full frames to lose the under.
Why The Under Grades Well
The key number is the mean. At 14.56 outs, the model is not flirting with the line. It is materially below it. To beat the ticket, Wacha needs to outperform his projected workload by nearly a full inning.
This is also backed by a solid sample. Wacha carries a 30-start sample into the model, so this is not one of the small-history spikes that can distort the top of the board on a thin slate.
| Item | Value | Why it matters |
|---|---|---|
| Captured price | -133 | Still playable before the number moves into heavier juice. |
| Fair odds | -359 | The model treats the under as a strong favorite. |
| Sample size | 30 starts | Enough history to trust the workload shape more than the one-game narrative. |
| Projection note | ridge-normal mu=14.56 sigma=3.65 | The center of the distribution sits far below 18 outs. |
What Could Beat It
The path against the bet is efficient contact management. If Wacha turns early counts into quick outs and avoids any stress innings, he can still glide into the sixth. But that is the higher-end outcome, not the baseline one in the current model.
Final Word
Michael Wacha under 17.5 outs is a workload bet, not a quality-start debate. The model lands well below the line, the sample support is strong, and the current price has not fully caught up. If 17.5 is still available at a reasonable number, the under remains a live research-desk play.