On International Signing Day 2026, the Seattle Mariners bolstered their farm system by adding multiple global prospects, highlighted by three Dominican Republic standouts ranked among MLB Pipeline’s top 50 international players.
The group includes Juan Rijo (No. 12), Gregory Pio (No. 32), and Leonardo Reynoso (No. 48). The Mariners also signed additional international prospects Jarvis Gomez and Ambeiro Recio, further strengthening their international class.
International players are eligible to sign with Major League organizations between January 15th and December 15th. However, they must turn 16 prior to signing and be 17 by September of the following year. This allows players born between September 1st, 2008, and August 31st, 2009 to be eligible for this year’s signing period.
In a press release, Mariners Director of International Scouting Frankie Thon Jr. expressed excitement about the organization’s newest additions.
Juan Rijo
Rijo, the highest-ranked player in Seattle’s international class, is an advanced hitter. The 17-year-old stands at 6-foot-1 and weighs 185-pounds after packing on significant weight to improve and tap into his raw power.
“We consider Rijo to be a uniquely advanced player,” Thon said. “He’s got a very well-rounded skillset with a chance to be solid-to-above average in every single facet of the game. It’s a mature, polished approach at the plate with a simple adjustable swing that we believe will lead to plenty of hard contact and high on-base skills.”
“Off the field, his work ethic is off the charts and his baseball acumen always shines through. We foresee big things for Rijo and are thrilled to be adding him to our minor league talent pool.”
Gregory Pio
At 16-years-old, Pio has had eyes on him for quite awhile. He offers great bat speed and projects potential for future raw power.
“Pio is a lean, projectable, exciting athlete,” Thon said. “There’s no denying the upside associated with his tools. The speed, defense and raw strength all have a chance to eventually be above-average. Defensively, he’s a slam dunk center fielder and we’re excited to see how the rest of his game develops in the next few years.”
Pio’s greatest current tool is his speed, both on basepaths and in the outfield. His stride length allows him to take extra bases and cover significant ground. He fits primarily as a center fielder, however competition at Seattle’s lower levels could lead to opportunities in the corner outfield spots as well.
Leonardo Reynoso
Reynoso leads the Mariners’ infield prospects in this signing class. With a strong, accurate arm and switch-hitting ability, he has the tools to remain an everyday infielder at shortstop, third base, or second base.
His left-handed swing is currently more refined due to greater in-game use, but his right-handed swing shows promising signs of developing legitimate extra-base power. Some evaluators project Reynoso as a 20–25 home run threat at maturity.
“He’s got a sweet swing from the left-hand side, geared for using the whole field and hitting for average,” Thon said. “Defensively, he projects to be more of a third baseman with a plus arm. Reynoso has extensive international tournament experience and has performed very well at the plate.”
Mariners Land Three MLB Pipeline Top-50 International Prospects