Ramon Marquez was named the Florida State League (FSL) Pitcher of the Week for the ween ending May 17, 2026. It marked the fourth time this season that a member of the Clearwater Threshers has received the honor. Alirio Ferrebus has won the award twice this season and Matthew Ferrera won the award once already this season. Marquez is the first Clearwater pitcher to win the honor.
For the week, Marquez was just one start against Lakeland, but Marquez pitched his heart out. In five innings, the right -hander threw five shutout innings against the Flying Tigers and gave up three hits and two walks while fanning nine batters. In two starts this season, the right-hander is 0-0 in nine scoreless innings. He has allowed two runs, but both were unearned. In his nine innings of work this season, Marquez has allowed four hits and has walked four hitters, but has struck out 14.
Let’s peek under the hood at what makes Ramon Marquez so tough to figure out for hitters:
Good — I now have enough to write a thorough and accurate scouting report. Note that the stress reaction references in the search results appear to pertain to two different players: the Ramon Marquez who is a Phillies prospect suffered a stress reaction that delayed his 2026 season start (per Baseball America’s May 2026 update), while the other stress reaction references are about Germán Márquez of the Rockies — a completely different pitcher. I’ll be careful to keep those separate.
Ramon Marquez: Philadelphia Phillies Prospect Scouting Report
Ramon Rene Marquez was born on September 19, 2005, in Phoenix, Arizona. Though he was born in the United States, Marquez later moved to Mexico, and the Phillies signed him as an international free agent for just $10,000 during the 2025 international signing period. That bargain price tag was eyebrow-raising even at the time, and it has looked more and more like a steal with each passing month. What the Phillies were betting on when they signed him was a combination of physical projection and raw stuff that they believed could develop quickly in their system.
At 6-foot-2 and around 180 pounds, Marquez has an athletic frame with projection left on it to add more strength. That still-developing body is actually a meaningful part of his appeal, because scouts generally believe there is more velocity and durability to come as he fills out physically.
Professional Career and Minor League Statistics
The Phillies liked his combination of athleticism, stuff, and feel for pitching enough to send him stateside for his pro debut, and after missing a good amount of bats over 10 Florida Complex League appearances, he got moved up to full-season Clearwater when the FCL season concluded. That kind of quick promotion from the Complex League to Low-A in a first professional season is a strong signal from an organization that he was ready to be challenged.
Across both the complex league and Clearwater in 2025, Marquez appeared in 14 games with 12 starts, throwing 55 innings. He posted a 30.3 percent strikeout rate, a 7.1 percent walk rate, and allowed just 0.65 home runs per nine innings. His ERA was 4.42, but his FIP — which strips out the defense behind him and focuses on what he actually controlled — came in at a much more encouraging 3.36. That gap between ERA and FIP suggests he was a bit unlucky on balls in play, and that the underlying performance was considerably sharper than the surface number implies.
He struck out a whopping 72 batters in just 55 innings and held the opposition to just four home runs all season. He also finished the year on a high note, with back-to-back five-inning starts where he gave up one run or less and recorded more than six strikeouts in each, including a one-hitter in his final outing. Finishing a debut season with that kind of momentum matters, and it suggested the quality of his stuff was not a fluke.
Early 2026 Season
Marquez had a delayed start to the 2026 season because of a stress reaction he suffered late in the 2025 campaign, but when he returned he came out firing, running his fastball up to 97 miles per hour and backing it with the slider and changeup he showed in his breakout 2025 campaign. The stress reaction was a concerning development for a young pitcher still building his professional track record, but his early 2026 performance has done a lot to ease those worries.
In his nine innings of work to start 2026, Marquez had yet to allow an earned run, and opposing batters managed just four hits against him for a .129 batting average. He has also been racking up strikeouts at an eye-popping rate, putting together back-to-back starts with nine strikeouts in each outing.
Pitch Arsenal
Marquez works with a three-pitch mix, and it is a genuinely interesting one for a 20-year-old. He sports a sinking fastball, a changeup, and a cutter/bullet-slider, and in his early 2026 starts he has been throwing each pitch at a higher than 25 percent clip. That kind of balanced usage across all three offerings is a good sign for his ability to keep hitters off-balance and suggests he already has a feel for pitching rather than simply overpowering hitters with one weapon.
The fastball is the foundation of what he does. Baseball America grades it at 55 on the 20-80 scouting scale and describes it as sitting 92-96 miles per hour, with Marquez touching 96 during his 2025 debut after sitting more in the 92-94 range when he first signed. It has ride-run properties and bores in on right-handed hitters, and he throws it with good sink to generate groundball outs. The velocity tick upward was already happening organically in his debut summer, and his 2026 return has seen it push as high as 97.
The changeup is widely regarded as the best pitch in his arsenal and, by some accounts, one of the best individual pitches in the entire Phillies organization. Baseball America named it the best changeup among all Phillies prospects. The pitch shows sudden drop and produced a miss rate of 62.1 percent in 2025. It has an absurd amount of sinking and tailing action, and some evaluators consider it the kind of pitch that could anchor a relief profile on its own. In his most recent 2026 outing, the changeup was sitting in the low 80s and generated a 70 percent whiff rate, getting hitters to swing and miss on seven of the ten times they offered at it. Baseball America grades the pitch at 60 on the 20-80 scale, which puts it solidly in the above-average category.
The slider is the newest and least developed of the three offerings. It will occasionally flash fringe average, but it needs a lot more work to consistently reach those heights, and Baseball America grades it at just 40. The good news is that at 20 years old with very little professional experience, there is ample time for the pitch to develop. The Phillies are also reportedly considering adding a two-seamer to his mix down the road.
Control and Command
One of the most impressive aspects of Marquez’s profile is how advanced his feel for the strike zone already is. His delivery is compact and repeatable, which allowed him to pound the zone at both of his 2025 stops. He walked just 17 hitters in 55 innings and projects to have plus control, which Baseball America grades at 60. Factoring in his Complex League appearances, he owns a solid 7.7 percent walk rate across 64 innings in the early stages of his career. For a teenager throwing across two different levels in his first professional summer, that kind of strike-throwing is genuinely unusual and is a big reason why scouts have taken notice.
Sabermetric Profile and Strengths
The numbers tell a compelling story. That 30-plus percent strikeout rate combined with a walk rate sitting below eight percent gives Marquez a very strong strikeout-to-walk ratio, which is one of the most reliable early indicators for a pitcher’s future ceiling. The FIP of 3.36 in 2025 was considerably better than his ERA suggested, pointing to real underlying quality. The miss rate on his changeup — north of 62 percent in 2025 and touching 70 percent in early 2026 starts — is an elite figure at any level, let alone Low-A. His overall whiff rate in his second 2026 start was 65.6 percent, with 19 total swings and misses across his arsenal in just five innings. The home run suppression is also notable: four home runs allowed across 55 innings in 2025 speaks to the heavy, sinking action on his fastball and the ground-ball tendencies it produces.
The weaknesses in his profile are fairly predictable for a pitcher at his stage of development. The slider being a work in progress means hitters who sit on the fastball-changeup combination can be more selective, which limits how deep he can work into lineups. Getting strong enough to hold up to a longer workload is another acknowledged area of development. At 182 pounds, he is not yet built to carry a full starter’s workload across a long professional season, and the stress reaction he dealt with late in 2025 is a reminder that young arms pushing into new professional workloads carry inherent health risks.
Injury History
Marquez suffered a stress reaction late in the 2025 season that delayed his start to the 2026 campaign. A stress reaction in a pitcher’s arm is a bone-related injury that typically requires rest and a gradual ramp-up rather than surgery, and his quick return to dominant form in 2026 suggests the recovery went smoothly. That said, it is worth monitoring going forward, especially as the Phillies push him through higher levels of the system where workloads and competition both increase.
Prospect Rankings and Outlook
As of early 2026, Marquez was ranked 14th among Phillies prospects by Baseball America and was the organization’s designated sleeper pick to watch for the season. MLB Pipeline had him at ninth overall in the system in their most recent update. The long-term projection is as a back-of-the-rotation starter, with the understanding that the slider development and physical growth will be the determining factors in how high his ceiling ultimately sits. Given that he is still only 20 years old with less than a full professional season under his belt, that projection is almost certainly a floor rather than a ceiling. The changeup alone is the kind of weapon that gives him a legitimate path to a major league career, and if the slider comes around even a bit, the conversation could get considerably more interesting.
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