Atlanta released Hernandez on Tuesday.
The right-hander opened the season on the injured list due to a shoulder cyst and was optioned to Triple-A Gwinnett in mid-April once he was recovered from the issue. Hernandez struggled to a 5.06 ERA, 1.90 WHIP and 26:19 K:BB over 21.1 innings at Gwinnett and will now hit the open market. He has a 3.38 ERA across 59 regular-season appearances in the big leagues, though his career 1.47 WHIP and 16.7 percent walk rate paint him as a volatile relief option.