Gregory Santos – Seattle Mariners Biography, Contract, Net Worth Information

Gregory Santos has carved out a reputation in Major League Baseball since he signed with the Boston Red Sox as an international free agent in 2015 for $275,000. Not long after, the San Francisco Giants traded for him, and the Dominican right-hander grinded his way through their farm system until he finally reached the majors. Now, Santos pitches for the Seattle Mariners on a one-year contract worth $771,100, a deal he signed after the Mariners picked him up in a trade from the Chicago White Sox in February 2024.

At just 24, Santos has seen his finances steadily improve. His net worth is estimated at $1,198,010, and there’s a good chance he’ll earn more as he settles in at the MLB level. He’s battled through injuries and bounced between teams, but that resilience has helped him lock down a spot in Seattle’s bullpen.

Santos’s journey from the Dominican Summer League to the majors really highlights how baseball talent can come from anywhere. His story mirrors the dreams of so many young international players who hope to make it big in the U.S. With a fastball that pops and secondary pitches that are coming along, Santos could land bigger contracts in the future if he keeps performing for the Mariners.

Gregory Santos: Early Life and Background

Gregory Omar Santos was born on August 28, 1999, in San Cristobal, Dominican Republic. That’s where his love for baseball really took root.

His early years laid the groundwork for what’s turning into a pretty promising MLB career.

Personal Life and Hometown

San Cristobal sits in the southern part of the Dominican Republic and has produced plenty of talented ballplayers. For Santos, growing up there meant baseball was more than just a game—it was a shot at a better future.

Dominican culture shaped Santos both as a person and an athlete. Like a lot of Dominican kids, he probably spent endless afternoons playing pickup games on dusty fields, using whatever gear he could find.

We don’t know much about Santos’s family life, but in the Dominican Republic, young prospects usually rely on a strong support system. Those early days in San Cristobal definitely played a role in shaping his work ethic and drive.

Amateur Career and Path to Professional Baseball

Santos started showing real promise early on, thanks to his arm strength and solid pitching mechanics. He developed his skills through local baseball programs that often feed into pro opportunities.

He took the first big step in his pro journey when he signed as an international free agent with the Boston Red Sox. That move showed scouts had already pegged him as someone special.

Then came the trade to the San Francisco Giants, where he kept working on his pitching arsenal. In the minors, he focused on his fastball—which eventually hit the high-90s—and added secondary pitches that are crucial for big-league success.

He made steady progress through the farm system, even as he faced the usual hurdles young pitchers run into. Santos made his MLB debut on April 22, 2021, at just 21, facing the Miami Marlins. That moment really proved how far he’d come and just how much potential he had.
Promising talent doesn’t always make it, but he did.

Professional Career Highlights

Gregory Santos has made a name for himself as a promising relief pitcher since his MLB debut. His strong arm and defensive instincts have turned him into a valuable asset for every team he’s joined.

MLB Debut and White Sox Tenure

Santos debuted in the majors on April 22, 2021, with the San Francisco Giants. After his stint there, he landed with the Chicago White Sox, where he started making waves as a reliever.

2023 with the White Sox really changed things for him. He earned the trust of coaches fast, thanks to a high-velocity fastball and nasty breaking stuff.

By the time he left Chicago, Santos had become a go-to guy in the bullpen. The White Sox trusted him in high-pressure moments, showing real confidence in his ability to deliver.

Impact as a Reliever and Defensive Skills

Santos has grown into a key reliever with an impressive set of pitches. His fastball regularly hits the upper 90s, and his slider gets plenty of swings and misses.

He doesn’t just pitch hard—he fields his position well, too. Quick reflexes and good hands make him more than just a flamethrower.

You can see his value in the numbers: strong groundball rates and solid strikeout totals. Managers know they can count on him when the game’s on the line.

Standing 6’2″ and weighing 190 pounds, Santos brings a physical presence that’s hard to ignore when he’s on the mound.

Notable Performances and Awards

Santos hasn’t picked up big awards like the Cy Young yet, but he’s put together some impressive outings in his young career. His calm under pressure really stands out.

In close games, he’s shown he can keep his cool. That poise has helped his teams win some tight contests.

The Seattle Mariners traded for him and signed him to a $771,100 deal for the 2025 season. Right now, he’s on the 60-day injured list, which is a setback, but not the end of the story.

He’s worked with other top relievers like Aaron Bummer, learning from veterans while putting his own stamp on his pitching style.

Gregory Santos’ Contract Details

Gregory Santos has experienced a range of MLB salary structures. His current contract with the Seattle Mariners marks a big step forward financially as he works toward arbitration.

Current Contract Structure

Santos is on a one-year, $771,100 contract with the Seattle Mariners. That’s fully guaranteed and matches his annual salary. The Mariners brought him in during the 2024 offseason.

Before Seattle, he made $720,000 per year with other clubs. The Mariners traded for him in February 2024, clearly seeing something they liked in his potential.

That move happened after White Sox general manager Chris Getz started reshaping the bullpen. Santos had shown enough for Seattle to take a shot on him.

Arbitration Eligibility and Implications

Right now, Santos sits in pre-arbitration status with 2.055 years of service time as of January 2025. That means the Mariners hold his rights and pay him close to the league minimum.

His path to arbitration matters for his future earnings. After the 2025 season, he’ll probably be eligible, and that could mean a big pay bump if he keeps performing.

MLB salaries tend to jump when players reach arbitration. For relievers like Santos, things like ERA, WHIP, strikeouts, and clutch performance will all factor into his next contract.

This pre-arbitration window gives the Mariners time to see what they have, while Santos gets a shot to prove his value before hitting arbitration.

Net Worth and Financial Overview

Gregory Santos has built a solid financial base since turning pro. His contracts and on-field performance have shaped his current status in the league.

Estimated Salary and Earnings

Santos now earns a salary of $771,100 with Seattle, up from $720,000 previously.

His earnings have climbed as he’s moved up the ranks. As a reliever, his contract size reflects both his role and his upside.

He’s built an estimated net worth of about $1,198,010, thanks to his contracts, bonuses, and other baseball income.

That kind of financial growth is pretty typical for a young MLB pitcher with real promise but still working to fully establish himself.

Endorsements and Other Income Sources

Unlike the league’s biggest stars, Santos hasn’t landed many endorsement deals yet. As a reliever who’s still building his reputation, those big brand partnerships may come later.

Most of his money comes straight from his MLB salary and any performance bonuses written into his contract. He probably has the usual mix of player investments and savings, too.

At 25, born on August 28, he’s got time to branch out and add new income streams as his career keeps rolling. Plenty of MLB players get into business or investing once they’re more established.

Right now, his spot on the 60-day Injured List could affect short-term bonus earnings, but his guaranteed salary is safe.

Notable Teammates and Influence

Gregory Santos has built some important relationships during his MLB journey. Playing for different teams has given him the chance to learn from veterans and develop his own style, all while contributing to team chemistry.

Dylan Cease

Santos connected with Dylan Cease while playing for the White Sox. Cease, famous for his wicked breaking ball and strikeout ability, shared tips on pitch sequencing and staying calm on the mound.

They often worked side by side in the bullpen, with Cease helping Santos tweak his slider grip. That mentorship really made a difference in Santos’s growth as a reliever.

“Dylan showed me how to trust my stuff in high-leverage situations,” Santos said after a strong outing in 2023.

Their styles—Cease with his heat, Santos with his sharp breaking pitches—complemented each other, especially when pitching back-to-back innings.

Relationship with Aaron Bummer

Santos and Aaron Bummer grew close in the White Sox bullpen. As fellow relievers, they spent a lot of time breaking down hitters and working on game plans for late innings.

Bummer, known for his ground-ball magic, helped Santos sharpen his sinker. That pitch became a real weapon for Santos. Their shared Dominican background also brought them together.

The two often watched game footage together, with Bummer offering advice on handling tough lefties.

“Aaron taught me patience and consistency,” Santos shared. “He showed me how to prepare my body and mind for the long season.”

Their friendship went beyond baseball, with family get-togethers and off-season workouts that made them even stronger as teammates.

Role Within the White Sox Organization

Before he joined the Seattle Mariners, Santos pitched out of the bullpen for the White Sox.

He started out as a developmental prospect, but the coaching staff really came to trust him. Pretty quickly, he became a reliable relief option.

Santos moved up from pitching in low-leverage spots to taking on those tense seventh and eighth innings. He could get ground balls when it mattered, especially with runners on base—honestly, that skill made him a real asset.

The White Sox put a lot of focus on his mental game. Coaches worked with him one-on-one to help him handle high-pressure moments.

Santos also threw himself into community outreach, especially with programs supporting youth baseball in Chicago’s Dominican neighborhoods.

His pay jumped from the league minimum to his current annual salary of $771,100. That says a lot about how much the organization believes in him as a key reliever.