His name doesn’t appear in any official MLB database yet. But in Venezuelan amateur scouting circles, Aaron Weffer is already a conversation. The 14-year-old right-hander — class of 2029, 6’4″ — is reportedly throwing 89 mph with a slider that registers 2,472 RPM of spin rate. Analyst Wilber Sánchez (@wilberdata) put him on the radar with a comparison that raised eyebrows: Jacob Misiorowski, the same Misiorowski who finished 2026 with a 1.80 ERA and 252 strikeouts to lead the National League. The hype is real. The question is how grounded the numbers are.
Just How Rare Is 89 mph at 14?
Very. According to TopVelocity, the average 14-year-old pitcher sits at 65 mph in 2026. The 75th percentile tops out at 73 mph. The top 1% of that age group reaches 82 mph. If Weffer’s readings are accurate, his 89 mph puts him in a category with no known age-comparable reference point.
That «if» matters. Weffer’s metrics come from amateur scouting shared on social media — not Statcast, not a calibrated professional radar gun. At that age, a 5 mph gap can be explained by the type of radar used, altitude, or the temperature on a given day. That’s not a knock on Weffer — it’s the context you need before projecting any trajectory.
What can be said without reservation: a 14-year-old who is generating serious conversation among Venezuelan analysts, who combines that velocity with 2,472 RPM on his slider, and who stands 6’4″ with a frame still filling out, has a physical profile that almost no prospect his age — in any country — can match.
The Misiorowski Comparison: A Compass, Not a Promise
Jacob Misiorowski closed 2026 with a season that will live in the record books: 16-5, 1.80 ERA, 0.80 WHIP, 252 strikeouts in 174.2 innings, and 6.5 WAR. On September 8, he became the first pitcher in Statcast history to log 1,000 pitches at 100+ mph in a single season. His fastball whiff rate was 45.6% — the highest ever recorded for a starting pitcher.
The comparison to Weffer isn’t about them becoming the same pitcher. It’s about profile: explosive fastball plus a high-spin slider. That’s Misiorowski’s signature combination. If Weffer’s tools are what @wilberdata describes, the mold makes sense as a conceptual starting point.
But Misiorowski is 24, has two All-Star appearances, and just pitched in the World Series. Weffer is 14 and hasn’t signed with anyone.
Sánchez’s tweet mentions Weffer could be «the first pitcher born in Venezuela» to accomplish something — the sentence was cut off, so that specific historical claim can’t be verified. What’s clear is the context: Venezuela had five players in the 2026 Futures Game and 14 prospects in the Arizona Fall League, 10 of them pitchers. The Venezuelan pitching pipeline is more active than ever — but a Venezuelan-born ace who becomes an MLB All-Star starter would still be a rare historical achievement. That’s what gives this story real weight if Weffer delivers.
When Could He Actually Reach MLB?
Weffer belongs to the international signing class of 2029. The signing window for that class opens around July 2027, when prospects turn or are close to turning 17. That means he has roughly two to three years before any MLB organization can sign him.
If and when he signs, he starts from scratch: rookie leagues, Dominican or Venezuelan academies, years in the minors. The typical path for an international prospect of this profile to reach the majors runs six to eight years from signing, with plenty of filters along the way.
For added context: the average MLB fastball hit a record 94.8 mph in 2026 — the sixth straight season it has climbed. By the time Weffer is eligible, that bar could be even higher.
For now, Aaron Weffer is exactly what a 14-year-old should be: a prospect with tools that demand attention, numbers worth tracking, and all the time in the world to prove — or disprove — the hype. Venezuelan scouting already has its eye on him. The rest of us will be watching.
