Zac Gallen Discusses Pitching Posted May 16, 2020 What makes Zac Gallen good is his command and ability to mix up his five-pitch repertoire. The numbers back up the promise. After debuting with the Miami Marlins last June (he was dealt to the D-Backs at the trade deadline), Gallen put up a 2.81 ERA and a 3.61 FIP over 15 starts. Despite lacking a power profile, he struck out 96 batters in 80 innings. (FanGraphs)