Hartlieb cleared waivers Saturday and was outrighted to Triple-A Las Vegas by the Athletics.
Hartlieb was DFA'd by the Athletics on Friday, but he will stay in the organization in Triple-A. He has spent the majority of the 2026 season with Las Vegas, where he has a 3.48 ERA, 1.39 WHIP and 41:10 K:BB across 33.2 innings (16 games, three starts).