The Oakland A’s called up pitcher James Kaprielian to serve as the 29th player on their roster for Tuesday’s doubleheader, the team announced.
Active rosters this season are normally 28 players, but on the day of a doubleheader each team is allowed to add a 29th man to help out. That player sticks around just for the day and then goes back to the minors, or in this case alternate training camp in San Jose. Check out the MLB Glossary for more details.
The addition of Kaprielian means there will be nine relievers in the pen Tuesday.