Brett Sullivan: Coors Field Catcher Flashing Real Power in a Tiny Window

Brett Sullivan just drilled a three-run homer on August 12, and his 7-day numbers are absurd enough to demand a closer look — even from a player WaiverScout has repeatedly deprioritized since late May.

Over his last 9 plate appearances, Sullivan is slashing .375 with 2 home runs, a .619 wOBA, an 11.1% strikeout rate, and an 11.1% walk rate. The exit velocity during that stretch sits at 96.3 mph with a 66.7% hard-hit rate. Those are elite-tier contact quality numbers, full stop. The question isn't whether the production is real in the moment — it's whether it means anything going forward.

The Rolling Window Story

The trend lines across Sullivan's rolling windows tell a clear narrative of recent escalation:

  • wOBA: .408 (30D) → .503 (14D) → .619 (7D)
  • K%: 20.0% (30D) → 18.8% (14D) → 11.1% (7D)
  • BB%: 3.3% (30D) → 6.2% (14D) → 11.1% (7D)
  • Hard-Hit%: 30.6% (30D) → 30.6% (14D) → 66.7% (7D)
  • Exit Velocity: 87.9 mph (30D) → 87.9 mph (14D) → 96.3 mph (7D)

Everything is moving in the right direction simultaneously. The strikeout rate has been cut nearly in half. The walk rate has tripled. The exit velocity jumped over 8 mph in the most recent window. When plate discipline and contact quality improve in tandem, that's a skill signal, not random variance — if it holds.

The Giant Caveat

We're talking about 16 plate appearances across 5 games. That's it. The confidence level here is "early signal" at best. Sullivan's 30-day hard-hit rate of 30.6% and exit velocity of 87.9 mph are far more representative of his baseline — and those numbers are pedestrian. The last week could be a legitimate mechanical adjustment, or it could be three well-struck balls in a Coors Field lineup creating a mirage.

Sullivan also profiles as a 32-year-old journeyman catcher — a 17th-round pick from the 2015 draft who is just now finding sporadic MLB opportunities. The pedigree doesn't inspire confidence, though pedigree doesn't hit baseballs.

Why WaiverScout Is Upgrading — Slightly

WaiverScout has tracked Sullivan since at least early June, classifying him as deprioritize eight separate times across May, June, July, and as recently as August 10. Twice before — on June 13 and July 7 — the algorithm bumped him to watch status before the signal faded. This is the third time he's earned that classification, and it comes with the best underlying data we've seen from him yet.

At 0% rostered with zero ownership velocity, nobody is paying attention. FantasyPros and ESPN list his profile without any significant hype. This isn't on anyone's radar — which is exactly why WaiverScout flags it now rather than later.

For managers streaming catchers or desperate at the position beyond options like Agustín Ramírez, Iván Herrera, or Gabriel Moreno, Sullivan is at least worth knowing about.

Verdict: Watch

Do not add Brett Sullivan right now. The sample is far too small, and his history of fading after brief flashes is well-documented in our own signal logs. But early signs suggest something could be emerging with his contact quality, and the declining strikeout rate paired with improved discipline is worth monitoring over the next 7-10 days. If the exit velocity and hard-hit rate hold through 30+ more plate appearances, this conversation changes. For now, bookmark and check back.