Today, Tuesday the 15th at 3 PM PT, is the deadline for the Mariners to add players to their 40-man roster who are eligible for the Rule 5 Draft. For a reminder on how the Rule 5 Draft works, click here, but the tl;dr version is the Rule 5 Draft was instituted to keep organizations from hoarding prospect talent on their minor-league rosters. This is why you’ll see a lot of low-level trades going on during these days as teams try to create space on their 40-man to accommodate the must-adds as well as players they want to protect from the Rule 5 Draft.
Predicting the additions to the Mariners’ 40-man roster
