Here’s a list of every selection for the Seattle Mariners in the 2021 MLB Draft. Grant tracked the first round of the MLB Draft for you here and you can read everything from Day One there. This list will be updated with signing bonus info for each pick as it becomes available.
First round (#12): C/OF Harry Ford, North Cobb HS, Kennesaw (GA)
Second round (#48): SS Edwin Arroyo Jr., Central Pointe Academy, Kissimmee (FL) (but originally from Arecibo, Puerto Rico)
Signing update: No official word yet, but multiple articles from Puerto Rico newspapers report that Arroyo has reached an overslot deal with the Mariners, although reportedly the number does not exceed $2M (slot value: $1.