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Stevenson was the Nationals' second-round pick in the 2015 Draft and is hitting .278/.331/.380 with a .711 OPS in the Minors this season. Voth has spent the season at Triple-A Syracuse, where he has posted a 3.37 ERA in 25 starts with 121 strikeouts and 51 walks in 144 1/3 innings. Ward, who played in the Fall League last season, has been showing off his power in the Minors with 14 home runs between Class A Advanced and Double-A this season.
Jamal Collier covers the Nationals for MLB.com. Follow him on Twitter at @jamalcollier. This story was not subject to the approval of Major League Baseball or its clubs.