Flexen, who pitched in the Korea Baseball Organization in 2020, impressed manager Scott Servais with his two-inning Cactus League debut against the White Sox on Friday, Daniel Kramer of MLB.com reports. "I really like what I saw," Servais said. "I think he does it a little bit differently. He's got the higher arm slot, and we saw all four pitches today."
The Mariners took a two-year, $4.75 million flyer on Flexen after he looked like a drastically improved pitcher with the Doosan Bears last season, and the right-hander seemingly carried over a lot of the positives into his first time facing MLB hitters since 2019. Flexen impressively worked through some of the White Sox's regulars in the outing, flashing an impressive pitch repertoire as well by complementing a sweeping curveball with a low-90s fastball and a cutter-changeup combination.