Heriberto Hernández Is Cleaning Up His Approach — And the Numbers Back It Up
Heriberto Hernández has quietly slashed his strikeout rate from 33.0% over the last 30 days down to 20.0% in the past week, and that shift is driving a real offensive breakout. His 7-day wOBA sits at .381 compared to .300 over 30 days. At just 8% rostered with zero ownership movement, the fantasy world hasn't noticed yet. WaiverScout has.
The Rolling Window Tells the Story
Start with the 30-day line: a .196 average, a .300 wOBA, and a bloated 33.0% strikeout rate across 106 plate appearances. That's a player most managers would ignore — and most have. But zoom in and the trajectory changes dramatically.
Over the last 14 days (52 PA), Hernández is hitting .262 with 3 home runs and a .391 wOBA. The K% has dropped to 28.8% while his walk rate has climbed to 17.3%. Now narrow it further to the last 7 days: a .286 average, .381 wOBA, 20.0% K%, and 16.0% BB% across 25 plate appearances. That's a hitter who is making better swing decisions in real time.
The power hasn't disappeared either. He's got 5 home runs over the last 30 days, including 1 in the past week and 3 in the past 14 days. The bat speed is there. What's changed is the selectivity — and that's the kind of improvement that sustains.
The Approach Shift Is the Signal
A strikeout rate dropping from 33.0% to 20.0% while walk rate rises from 12.3% to 16.0% is not a fluke. That's a player who is seeing the ball better and expanding less. The 30-day hard-hit rate of 39.6% and average exit velocity of 85 mph aren't elite, but they don't need to be if he's putting more balls in play with that kind of plate discipline. Contact-plus-walks is a floor raiser, and the power is already established with those 5 homers over the past month.
His last five games show the discipline in action: 4 walks against just 3 strikeouts. He went 2-for-4 with a walk in his most recent game. He's not chasing.
WaiverScout Has Been Watching Since June
We first flagged Hernández back on June 2nd when he was rostered in essentially zero leagues. He's appeared in our system 10 times since, moving from deprioritize to watch as the underlying skills developed. He's been classified as a watch in five of his last six signals, and the data supporting that classification has only strengthened. This isn't a player who appeared out of nowhere — WaiverScout identified the talent early and has tracked the approach refinement in real time.
No major fantasy outlet is talking about him right now. This signal is ahead of the mainstream.
Ownership Window
At 8% rostered with stable velocity, Hernández is sitting on waivers in nearly every league. He's getting consistent playing time — 25 PA in the last 7 days confirms he's in the lineup regularly for Miami. If the K% stays in the low 20s, the batting average will follow, and the power makes him relevant in any format. He's competing for at-bats alongside players like Trent Grisham and Christian Yelich, but the recent workload suggests the Marlins want to see what he can do.
Verdict: Watch
Hernández is a watch, not an add — yet. The approach improvements are real and the data is clear across 52 plate appearances, which gives us a solid sample to work with. But the 30-day exit velocity (85 mph) and hard-hit rate (39.6%) need to climb before this becomes a must-add. If the discipline holds for another week and the batted-ball data catches up, he'll move into add territory quickly. Get him on your watch list now. In deeper leagues (14+ teams), he's worth a speculative add today. The signal has been building for months — don't wait until the ownership spike makes the decision for you.