Jonah Heim: The Exit Velocity Spike Is Real, and the Power Is Following

Jonah Heim just posted a 91.1 mph exit velocity and 45.9% hard-hit rate over the last seven days — and he's sitting at 2% rostered. If you're streaming catchers or stuck in a black hole behind the plate, this is the kind of signal you monitor closely.

What the Rolling Windows Tell Us

The last seven days have been Heim's most impressive stretch of the recent window. A .261 AVG with 2 home runs, a .370 wOBA, and 25 plate appearances paints a picture of a catcher getting regular at-bats and doing damage with them. But the real story is underneath the surface-level slash line.

Compare the Statcast data across windows and the trend becomes impossible to ignore:

  • 7-day: 91.1 mph EV, 45.9% HardHit%
  • 14-day: 87.6 mph EV, 29.8% HardHit%
  • 30-day: 88.0 mph EV, 32.7% HardHit%

That's a 3.5 mph jump in exit velocity from the 14-day mark to the 7-day window, and the hard-hit rate has surged from 29.8% to 45.9%. This isn't gradual improvement — it's a gear change. When exit velocity and hard-hit rate spike together like this, the power numbers tend to follow. And they already are: 2 homers in his last 5 games, including a solo shot in Saturday's loss to the Angels as noted by FantasyPros.

The 30-Day Picture Adds Context

Zoom out to 30 days and Heim has been legitimately productive: a .310 AVG, 6 home runs, and a .423 wOBA across 64 plate appearances. That's elite-level production at catcher, a position where the bar for relevance is underground. His K% has been steady in the 18-20% range across all three windows, and his walk rate ticked up to 8.0% over the last week from 7.8% over 30 days — nothing dramatic, but it confirms he's not chasing more as the power arrives.

The 38-PA sample over his last 5 games gives us solid confidence in the recent trend. This isn't a two-game mirage.

WaiverScout Has Been Tracking This

We first flagged Heim back on April 22 as a watch candidate when he was at 0% rostered. The signal wasn't there yet — we moved him to deprioritize multiple times through May and into June as the production fluctuated. But on June 14, we upgraded him back to watch at 1% ownership, and just twelve days later downgraded again. Now the signal has strengthened to its clearest point yet. The exit velocity jump and hard-hit rate explosion are the validation we were waiting for. The data is clear: the underlying quality of contact has taken a real step forward.

The Ownership Window

At 2% rostered with stable velocity, Heim is invisible to most leagues. He's not showing up on mainstream add lists. For context, catchers like Gabriel Moreno, Carter Jensen, and Shea Langeliers command far more attention, but Heim's 30-day wOBA of .423 and 6 homers over 64 PA would stand up against most rostered backstops. Razzball projects him for 150 games with platoon value, suggesting consistent playing time isn't going anywhere.

Verdict: Watch

The recommendation is watch, not add — yet. The 7-day Statcast numbers are legitimately exciting, but Heim needs to sustain the 91+ mph exit velocity and elevated hard-hit rate beyond one week before he becomes a must-add. If the next 7-day window shows the same contact quality, this moves to an add in all formats. For now, put him on your watchlist, monitor the Statcast data, and be ready to move before the ownership percentage catches up to the production. The numbers back it up — you just need a few more days of confirmation.