Age on Opening Day 2014: 25
How acquired: Draft (2nd round), June 2009
MLB service time: 63 days
PHILADELPHIA — The Nationals made their final round of September call-ups on Tuesday, promoting five more players from Class AAA Syracuse, including infielder Zach Walters.
NEW YORK — Ross Detwiler is dealing with stiffness in his lower back, an ailment that could prevent the Nationals left-hander from making his next start.