The Mariners selected Bliss's contract from Triple-A Tacoma on Monday, Ryan Divish of The Seattle Times reports.
The 24-year-old infielder receives his first major-league promotion after putting up a .247/.382/.445 batting line with seven home runs and 28 stolen bases this season with Tacoma. The right-handed hitting Bliss plays both middle infield spots and could get some starts at second base versus lefties due to Jorge Polanco (hamstring) going down.