 He began the 2019 season with the Tacoma Rainiers of the Class AAA Pacific Coast League.Polo was released by the Mariners organization on April 19, 2019, after being suspended 25 games by the Pacific Coast League for spiking El Paso Chihuahuas first baseman Alex Dickerson during a game on April 17..Despite this Polo claimed it was an accident caused by running with his head down thus not allowing him to see Dickerson's foot.