Last season Chris Prieto was the Mariners first base coach. However, with the hiring of Perry Hill who became the Mariners first base coach, they decided to move Chris over to third base.
Now being the Mariners third base coach his approach is for the players to be aggressive on the base paths. You will see the guys often going from first to third along with scoring from third to home. A lot of this will depend on where the ball is hit along with the arm of the outfielder and how many outs plus the score in the game.