"Both of our young catchers that we sent out today have bright futures," manager Matt Williams said.
Severino advanced to Class A Advanced Potomac last season, hitting .247 with nine home runs and 36 RBIs in 94 games. Kieboom is coming off a productive season with Class A Hagerstown, where he hit .309 with nine home runs and 61 RBIs in 87 games. He was named a South Atlantic League Midseason All-Star and a MiLB.com Organization All-Star.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the Time. He also can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.