The Mariners selected Davis' contract from Triple-A Tacoma on Monday.
Davis could have opted out of his minor-league contract, but the Mariners have elected to add the outfielder to their 40-man roster to prevent that from happening. The 26-year-old is sitting on a .281/.394/.548 batting line with eight home runs and a 20:38 BB:K over 38 contests with Tacoma this season. Davis has yet to appear in a major-league game.