Hartlieb pitched only twice for Miami since his contract was selected in early August. He threw four innings of one-run ball with three strikeouts and walks apiece. The 29-year-old righty has spent the bulk of the season in Jacksonville after signing an offseason minor league pact. He has performed well in a hitter-friendly environment, working to a 3.29 ERA while striking out over a quarter of opponents through 38 1/3 innings.
A former 29th round pick of the Pirates, Hartlieb has logged parts of four big league seasons between Pittsburgh, the Mets and Miami. He has a 7.17 ERA in 70 1/3 MLB frames. He has a far better 3.86 ERA in parts of four seasons at the Triple-A level.
Hartlieb has been outrighted twice in his career, meaning he can decline this assignment in favor of free agency. If he chooses to stick with Miami, he’d qualify for minor league free agency at the beginning of the offseason unless the Fish call him back to the majors.