The Nationals designated Lawrence for assignment Tuesday.
Lawrence was a waiver claim in late June and allowed three runs with a 6:7 K:BB over 6.1 innings with the Nationals. The righty holds a 7.34 ERA, 1.95 WHIP and 43:28 K:BB across 34.1 frames between the Nats, Twins and Pirates this season, and this is the third time since late May that he's been designated for assignment.