The Mariners claimed Hernandez from waivers Friday.
Hernandez was designated for assignment by the Rangers on Tuesday after Texas acquired southpaw Andrew Chafin in a trade with Detroit. Across 26 major-league outings this season, Hernandez has a 5.05 ERA, 1.59 WHIP and 36:26 K:BB across 41 innings. The 28-year-old right-hander will likely begin his tenure with his new organization with Triple-A Tacoma, but he could make his way back to the majors if the Mariners require his arm out of the bullpen.