The Nationals claimed Roxby off waivers from the Giants on Thursday.
The 27-year-old Roxby reached the majors in 2026 for the first time, allowing two runs with a 3:2 K:BB across 5.1 frames. Roxby -- who logged a 3.78 ERA and 60:26 K:BB over 64.1 innings with Triple-A Sacramento -- will compete for a bullpen job with the Nationals, assuming he's still in the organization for spring training.