MESA, Ariz. -- Breyson Guedez doesn’t look like a teenager trying to survive the Arizona Fall League. He looks like he belongs in the middle of it, grinning through every step, every at-bat, every trip around the bases.
At 19, the Athletics prospect is the third-youngest player in the 2026 AFL, and maybe the most visibly upbeat. He carries that smile into the on-deck circle, keeps it on the basepaths and never seems to stop moving in the outfield. The production hasn’t matched the energy just yet with the Mesa Solar Sox, but the tools and the approach that got him here are impossible to miss.
Through 15 games, Guedez is hitting .175/.288/.228. That line tells one story, but not the whole one.
He has driven one-third of his balls in play - 13 of 39 - at 95 mph or harder in the Fall League, and nine of those ended up in defenders’ gloves. His hardest contact, a 109.3 mph blast, is the highest exit velocity posted by any Athletics player in the AFL.
That kind of line-drive damage showed up all season long in his first year in the United States. Guedez posted a 30.1 percent line-drive rate in the regular season, second among all qualified Athletics Minor Leaguers and the best mark in the Minors for any hitter who was still in his age-18 season and had played above Rookie level.
“He was born to hit,” said Mesa third-base coach Gunnar Buhner, who served as the Athletics’ Arizona Complex League manager in 2026. “There's just some people that are born, and out of the womb, they just can swing it, man.
I mean, he can hit anything. He can swing at anything out of the zone and he gets good results.”
Athletics left-handed pitching prospect Grant Richardson, who has been Guedez’s teammate in both the Fall League and with Single-A Stockton, put it simply: “He can hit with the best of them,” said Athletics left-handed pitching prospect Grant Richardson, Guedez’s teammate in both the Fall League and with Single-A Stockton. “He's fun to watch play ball.”
The A’s pushed Guedez past the Arizona Complex League, and he answered by forcing his way out of Single-A after only 91 games. When he earned the promotion, he ranked second in the Cal League with 119 hits. He finished his last 13 games there with a .403 average and a 1.035 OPS, enough to earn the next test at High-A.
That jump put him in a rare group. Only five players had more than 40 plate appearances in their age-18 season at that level: Eli Willits (WSH No.
1 / MLB No. 6), Juneiker Caceres (CLE No.
3 / MLB No. 74), Brady Ebel (MIL No.
4 / MLB No. 93), Elian Peña (NYM No. 3) -- the No. 3 prospect in the 2025 international class -- and Guedez.
His 134 plate appearances with Lansing were second-most among that group, behind only Willits.
Of course, the same aggressive bat path that helps him do damage also gives pitchers something to work with. In his short stint with the Lugnuts, Guedez’s walk rate fell to 3.0 percent, and his .320 batting average on balls in play came back down after sitting at an eye-popping .411 with Stockton.
That’s the tradeoff as he moves up the ladder and faces older, more polished arms. Pitchers at the next levels are more likely to tempt him outside the zone, and that free-swinging style is one reason he did not crack MLB Pipeline’s Top 50 International Prospects list, even after signing for $1.5 million in a 2025 class that also included two-way player Shotaro Morii (ATH No. 15).
Still, the overall body of work in 2026 was hard to ignore. Every one of Guedez’s 548 plate appearances came against older pitchers, and even with the late-season dip after his promotion, he hit .299 with a .773 OPS across the levels while being three to four years younger than the average hitter in his circuit.
Few teenage prospects boosted their stock more sharply this year than Guedez, who now sits as the Athletics’ No. 9 prospect.
His rise was already turning heads before his run through Single-A. During Spring Training, he launched a 110.4 mph, 450-foot homer off eight-year MLB veteran Michael King, then followed that with a 425-foot homer in Spring Breakout nine days later.
That Spring Breakout lineup also featured three players - Henry Bolte, Tommy White and Joshua Kuroda-Grauer (ATH No. 4) - who reached the majors in 2026, along with Leo De Vries (ATH No. 1 / MLB No. 3), another reminder of the talent the Athletics have coming.
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