The Seattle Mariners have announced that their pitcher, Casey Sadler, will undergo season-ending shoulder surgery. Casey tweeted earlier that the season is over and he is heading to the 60-day injured list. However, there is good news for fans. Matt Koch will now join the Mariners bullpen. Casey Sadler will be out of action until early 2020. Sadler will likely join the 60-day injured list at some point.