Ray has been a bit walk-prone (11.4 BB%) and has given up more homers than average (1.61 HR/9). A high K rate (27.3 K%) helps him out, along with a low BABIP (.180) and high strand rate (97.7 LOB%). Very much a ground ball pitcher this year (53.7%).
Mikolas? There's nothing good about his performance. 3.45 HR/9 is ridiculous, his BB% is close to Ray's (11.1 K%), but he Ks next to no one (13.6 K%) and has nearly double Ray's BABIP (.345). With 4 appearances, he's going less than 4 IP per appearance.