It will be the first opener assignment for Yean, who has tossed 5.1 scoreless innings covering his first three major-league three appearances. Andrew Alvarez is in line to serve as the Nationals' bulk reliever.

The right-hander received his first promotion to the majors July 5 and made his debut that day versus Pittsburgh, firing two scoreless frames before returning to Rochester. Yean has pitched to a 3.35 ERA, 1.09 WHIP and 47:20 K:BB across 43 innings for Rochester this year, and it may not take much for him to stick around Washington's bullpen given the immense struggles the unit has gone through this year.