Atlanta recalled Mederos from Triple-A Gwinnett on Wednesday.
Atlanta is swapping in Mederos for Connor Thomas, who was needed for 3.2 innings out of the bullpen in Tuesday's loss to the Pirates. Mederos made one two-inning scoreless appearance for Atlanta earlier this season and holds a 5.40 ERA and 39:22 K:BB over 43.1 frames at the Triple-A level in 2026.