Tuesday was the deadline for the Seattle Mariners to set their 40-man roster ahead of the upcoming Rule 5 Draft, and they opened the door for a few of their top-30 prospects to be stolen away from them.

Six of the team’s top-30 prospects were left off the 40-man and are eligible for the Rule 5 Draft. For reference, not all prospects are Rule-5 eligible, only those who have been in the same organization for five years or four years, depending on what age they were signed.

There are six prospects within the Mariners’ top 30 for MLB Pipeline who fit the requirements, and who are now eligible to be drafted by other teams on December 10: pitcher Michael Morales (No. 18 overall prospect), pitcher Marcelo Perez (No. 19), 1B/3B Luis Suisbel (No. 20), OF Carlos Jimenez (No. 27), OF Victor Labrada (No. 29), and pitcher Tyler Cleveland (No. 30).

Six of the Mariners’ best prospects are now eligible to be taken away in the Rule 5 Draft

The most intriguing of those names is Morales, the Mariners’ third-round pick in 2021. Morales had a strong 2024 season, posting a 3.02 ERA across multiple levels. However, the 23-year-old struggled in Arkansas in 2025, and it’s possible the Mariners don’t view him as a part of their plans anymore. He probably won’t be involved in their future rotation, so it depends on if the Mariners think he could be reliever. If not, it makes sense not protecting him.

Suisbel is another interesting name. The Mariners No. 20 prospect has plenty of raw power, with a Power Grade at 50 and 23 home runs in 423 at-bats in High-A last year. However, it’s hard to see where the 22-year old fits with the team long-term, especially after the Josh Naylor contract. He is likely a first baseman only at the big league level.

Labrada stands out after his time in Tacoma last season. In 61 games, he had a .773 OPS for the Rainiers with 40 runs scored and 14 stolen bases. He stole 30 bases earlier that year with Double-A. He could be a fringe-MLB player for his speed and defense alone, but his bat likely won’t play at a big league level. Still, it would be sad to see him go after years of gracing the Mariners minor-league system with his speed.