Washington optioned Herz to the Florida Complex League Nationals on Friday, Bobby Blanco of MASNSports.com reports.
With Herz not scheduled to start during the weekend series against the Phillies, the Nationals will switch out the 23-year-old southpaw for long reliever Jackson Rutledge. Herz started 19 games for the Nationals this season, posting a 4-9 record with a 4.16 ERA, 1.26 WHIP and 106:36 K:BB across 88.2 innings. He was briefly sent down to Triple-A Rochester in early July, but he returned to the big club after the All-Star break. Since his recall, his numbers slightly improved to a 3.61 ERA and 1.19 WHIP over 57.1 frames.