Log in to your Seattle Mariners World MasterCard with Extra Bases Rewards Account

You will find the log in to your account with Seattle Mariners World MasterCard with Extra Bases Rewards by logging in to their website:

  • https://www.mlb.com/mariners
  • The log in box is in the upper right corner of the page, under the login icon. Put the cursor/mouse on the login icon, click on it and enter your user name and password and sign in/login to your account. 
  • You can register an account by using the home page/website address front page provided above. Click on the login icon upper right corner and then click on sign up which is beside the don’t have an account yet?
  • Check the following screenshots of Seattle Mariners World MasterCard with Extra Bases Rewards.
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