Montero (2-0) struck out a batter in a perfect ninth inning Thursday, ultimately earning the win in a 7-3 extra-inning victory over Boston.
The righty lowered his ERA to 2.61 and his WHIP to 0.77 in 10.1 innings. Montero boasts a four-pitch repertoire that's slightly unusual for a reliever, but it has proven effective thus far in 2021. Seattle's surprising early-season success has given Montero high-leverage innings, but blowing three of his first six save opportunities has opened the door for Kendall Graveman and Keynan Middleton to become part of the closing picture for the Mariners as well.