Seattle Mariners Top 10 Prospects for 2026 Fantasy Baseball

Seattle Mariners Top 10 Prospects for 2026 Fantasy Baseball

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Format = Player Position | Age on 1-4-2026 | Highest level played | Estimated time of arrival

1. FROM Lazaro Montes | 21 | AA | 2027

At 6-foot-4 and 215 pounds, Montes has slimmed down without sacrificing strength as he has climbed the organizational ladder. In 131 games, almost evenly split between High-A and Double-A, the big lefty hit 32 home runs, stole seven bases and slashed .241/.354/.504 with a 29 percent strikeout rate. The strikeouts have invited their fair share of doubters, but I think Montes will. enough impact on the contact to become a mainstay in fantasy lineups.

2. SS foal Emerson | 20 | AAA | 2026

Seattle drafted Emerson out of high school at the 22nd pick in the 2023 draft. He was a 6-foot-4, 195-pound left-handed middle infielder with excellent hands in the batter’s box. He came roaring out of the gate in his draft season but battled an injury in 2024, missing two stretches and playing 70 total games. 2025 was a year in which the water level was restored. Emerson’s hitting tool took him all the way to Triple-A, where he hit .364 with two home runs in six games to close the game. The roster source lists Ben Williamson as the starting third baseman, and while that may be true for spring training, Emerson will enter the picture sooner or later.

3. LHP Kade Anderson | 21 | Ncaa | 2027

Anderson was the third overall pick in the 2025 draft and went 12-for-1 for LSU as a sophomore, posting a 3.18 ERA and 1.06 WHIP with a whopping 180 strikeouts in 119 innings. With a dominant and deceptive fastball in addition to three-plus off-speed pitches he can throw for strikes, Anderson was far too much for most college hitters. Seattle rested him after the draft, but he looks like a fast mover who can help this team during the current battle cycle.

4. RHP Ryan Sloan | 20 | A+ | 2027

At 6’5″ and 220 pounds, Sloan is a power pitcher who flushes hitters with a triple flow of splitter, slider and fastball. The 55th overall pick in the 2024 draft, he posted a 3.73 ERA and 1.16 WHIP with 92 strikeouts against just 15 walks in 82 innings across two levels. His upside may be the highest on this list relative to his cost given the skills and the setting.

5. SS Felnin Celesten | 20 | A | 2028

Celesten, a switch hitter who signed for $4.7 million in 2023, has lost time due to injury but still managed to impress during his short professional career. In 93 Low-A games, he slashed .285/.349/.384 with five home runs and 20 stolen bases, earning an 11-game debut at High-A to end the season, where he will likely open 2026. Celesten has a steep bat path from both sides that is designed for lift. He could unleash a surprising power season if it all comes together with manpower in his early 20s.

6. SS Michael Arroyo | 21 | AA | 2027

At 5’10” and 160 pounds, Arroyo doesn’t drop much jaw when he steps off the bus, but he’s always thoroughly impressed between the white lines. His 56-game stretch in Double-A wasn’t the stuff fantasy dreams are made of, but his slash line of .255/.376/.341 with two home runs was good for a 123 wRC+ in a depressed setting for offense. In 121 games at two levels, he scored 18.7 percent of the time with a walk rate of 12.4 and a wRC+ of 139. His ETA is listed here as 2027, but he could quite easily push that to this season if the need arises.

7. FROM Jonny Farmel | 21 | A+ | 2028

Farmo was a 6’2″, 205 lbs left-handed hitter. He was taken 29th overall in the 2023 draft and immediately received rave reviews. The team sent him to Low-A, and Farmolo hit .264/.398/.421 with four home runs and 18 stolen bases. The club knew he would be impressive from a speed and power perspective, but the patience and impact in Low-A were probably both pleasant surprises A torn ACL ended his season prematurely, otherwise he might have played his way to the top of this list He returned to a High-A field in late 2025 and slashed .230/.318/.460 with six home runs and two steals in 29 games.

8. RHP Jurrangelo Cijntje | 22 | AA | 2026

Cijntje is a switch pitcher with legitimate upside from both the right and left sides, hitting 99 with the heat and 91 with a slider from the right side and living in the low 90s from the left side, where he possesses a solid sweeper. Seattle selected him 15th overall in the 2024 draft after he pitched in the SEC for Mississippi State for two seasons. In 108.1 innings across two levels in 2025, he posted a 3.99 ERA and 1.22 WHIP with 120 strikeouts against 51 walks. If he were only developed as a right-hander, he would move up a few spots on the lists. As it is, I’m not sure what to do with him. As a right-handed pitcher, will he learn multiple ways to attack left-handed hitters? Or will the back and forth condemn him to some sort of hybrid swingman role?

9. FROM Yorger Bautista | 18 | DSL | 2030

Bautista was a handy lefty at 6-foot-1 and 175 pounds. He signed for $2.1 million with the 2025 international class and spent the season in the Dominican Summer League, where he slashed .223/.326/.404 with seven home runs and a 29.8 percent strikeout rate. That’s a lot of swing-and-miss for a big-money signing, but Bautista buys himself a lot of lanes with his easy plus power and speed.

10. C Luke Stevenson | 21 | A | 2027

Seattle took Stevenson with the 35th overall pick in 2025 after he hit 33 home runs in 125 games at North Carolina. He controlled the strike zone well as a collegiate and carried that over to Low-A for his 20-game post-draft debut, where he walked more (23%) than he hit (19%), while slashing .280/.460/.400 with a 154 wRC+. Where will he play in this organization? Well, I’m not sure he will, because he’s a good defender, and Seattle will likely be looking for an addition at the trade deadline this year.

Thanks for reading!

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