Stock up, stock down for all 9 of Mariners' top 100 prospects at end of MiLB season

Heading into the 2025 season, the Mariners were seen as having one of the best farm systems in baseball. They have since managed to place nine players in MLB Pipeline's Top 100 prospect list thanks to a solid draft strategy and great player development infrastructure.

While the big league team is just getting started, the minor league seasons are starting to wrap up. With a full year of results to look back on, we can try and anticipate who'll continue moving up through the ranks and who has some more work to do.

Stock Down

Felnin Celesten (No. 92-ranked MLB prospect)

Although he did manage to get promoted to High-A in the final days of the season, Celeste's numbers over a full season of Single-A weren't as impressive as his $4.7 million signing bonus might have indicated.

Over 424 plate appearances with the Modesto Nuts, he posted a wRC+ of just 107, largely limited by his lack of power and .099 ISO. To be fair, he is coming off of a wrist surgery that caused an abrupt halt to his season last year, but his numbers were lackluster enough for him to fall off of other Top 100 lists.

Celesten will have a lot to prove heading into 2026, but he'll still be just 21 years old and with the right adjustments, could be one of the most promising names in the Mariners system once again.

Jonny Farmelo (No. 79-ranked MLB prospect)

Like Celesten, Farmelo has dealt with his fair share of serious injuries, including an ACL tear in 2024 and stress reactions in his ribs this year. He was held to just 129 plate appearances with High-A Everett this year and posted a 103 wRC+ with a 29.5 strikeout percentage, hardly numbers that meet his lofty prospect expectations.

He'll get a chance for more playing time in the Arizona Fall League which should hopefully get him back on track. He had some good moments this year but they were fewer and further in between than most would probably have liked given his prospect pedigree.

Stock Up

Jurrangelo Cijntje (No. 90-ranked MLB prospect)

The Mariners' first-round pick in the 2024 draft didn't have the smoothest start to his professional career, but with more innings under his belt and a step up in competition, he has finished the season strong, posting a 2.67 ERA 33.2 Double-A innings. There were some concerns as to whether the Mariners would be able to fully utilize his ambidextrous qualities, but he's proven that he can be effective from both sides.

Michael Arroyo (No. 59-ranked MLB prospect)

Arroyo was one of the biggest climbers in the Mariners' farm system this year. He posted a very respectable 153 wRC+ in High-A before being promoted to Double-A and continuing the strong momentum with a 123 wRC+ to finish the year.

He struggled to hit for much power at the higher level of competition, but he became a master of plate discipline, walking at a 12.0 percent clip while striking out just 15.6 percent of the time. He's poised to be yet another top-tier middle infield talent for Seattle in the years to come.

Ryan Sloan (No. 41-ranked MLB prospect)

While not as explicitly flashy as his fellow 2024 draft pick Jurrangelo Cijntje, Sloan was seen by many as arguably the better pick. He received a $3 million signing bonus, nearly twice the estimated value for the 55th overall pick where he was taken.

Sloan pitched extremely well in Single-A, posting a 3.44 ERA with a 2.91 FIP, 27.1 percent strikeout rate, and 5.3 walk rate. He was promoted to High-A for the final three starts of his season, where he struggled over 11.1 innings, but his 5.56 ERA over a small sample against stiffer competition doesn't overshadow the great work he did earlier in the year.

Harry Ford (No. 39-ranked MLB prospect)

Despite already being called up and having his first major league moment, Harry Ford is still very much a prospect. One of the better comeback stories of the year, there were plenty of questions surrounding his viability in the box and behind the dish, but he put many of those concerns to rest this year.

He posted a 125 OPS+ over 458 plate appearances in Triple-A and more importantly slugged .460, the highest mark for a full season in his career thus far. With Mitch Garver on his way out, he could parlay this success into earning a role as Cal Raleigh's backup next year or become the centerpiece of a major offseason trade.

Lazaro Montes (No. 28-ranked MLB prospect)

Montes is no stranger to being in the spotlight, as he has been under the microscope since he signed as an international free agent for $2.5 million in 2022. Known for his incredible power, he demonstrated that this year with a .572 slugging percentage in High-A and hitting 32 total home runs in the minor leagues this year.

His numbers dipped considerably after being promoted to Double-A, but he seems more than ready to hit the ground running as one of the best hitting prospects in baseball next year.

Kade Anderson (No. 22-ranked prospect)

Even if he has to throw his first pitch at a professional level, Anderson is coming in with an impressive resume. In his final season at LSU, he posted a 3.18 ERA with 13.6 K/9 over 119 innings and helped lead LSU to another College World Series win. Notably, he was the starting pitcher responsible for bringing Coastal Carolina's 26-game win streak to an end, throwing a complete game shutout and allowing his team to win 1-0.

His pitching ability is unquestionably elite, which is why the Mariners have decided to focus on getting his body conditioned and ready to handle the length of a full professional season. He may even get a chance to debut as soon as next year, something fellow LSU ace Paul Skenes did with the Pirates in 2024 after being drafted the year prior.

Colt Emerson (No. 11-ranked prospect)

The Mariners' top-ranked minor leaguer hasn't shown any signs of slowing down since being selected in the first round of the 2023 draft. He spent the majority of his year with High-A Modesto before leveling up to Double-A Arkansas, posting strong numbers at both levels.

Following his surprise promotion to Triple-A Tacoma, Emerson has an ETA of 2026. This could create a logjam, as next year will be the final year of J.P. Crawford's contract, but he continues to make a strong case that he's ready for his call.