The Mariners have called up Shortstop prospect Brad Miller. The 23 year old will join the Mariners Friday and is expected to play.  He will replace struggling weak hitting shortstop Brenden Ryan, who has been hitting under 200 for most of the year.  Miller, riding a 22-game hitting streak at Triple-A Tacoma, was told after Thursday night's game with the Rainiers that he was getting called up.

Ranked as the Seattle's sixth-best prospect, Miller will join a Mariners roster that has already added two other top position prospects -- second baseman Nick Franklin and catcher Mike Zunino -- in the past month.

The Mariners are hoping that Miller will give the struggling offense a boost. The M's offense which ranks at or near the bottom in most offensive categories.

Miller has hit at every level of the Minors in his quick rise since being a second-round Draft pick in 2011. He's hit .334 in 219 games over three Minor League seasons, including .356 with six home runs and 28 RBIs in 26 games for Tacoma since being promoted from Double-A Jackson this year.

The Mariners open a series against the Chicago Cubs at Safeco Field tonight and Miller is expected to be in the line-up.

To make room for Miller the Mariners have to take someone their 25 and 40 man rosters.