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The Official Site of the Seattle Mariners

Mariners Grand Slam Camps

For nearly 25 years, Grand Slam Sports have run baseball and softball camps that are real summer camps, like parents remember from their childhood. You can count on top quality and personal instruction while having a blast. After all, it is a game and should be fun - lots of fun!

Registration for Mariners Grand Slam Camps is now closed for 2017. Please check back soon for information on 2018 camps.