He was an All-Star in 2024 and was even better in 2025. In terms of Red Sox pitching acquisitions, he breaks the mold of what Craig Breslow has targeted over his tenure. He's only 6'1" with 6.2 feet of extension. His fastball sits between 90-91 mph, considerably below most of the pitchers Breslow has acquired. It's not necessarily a bad thing, though. While the lack of overpowering velocity limits his strikeout upside, it should help him age gracefully.
"We have to carry three catchers [on the postseason roster] because of where Will [Smith]'s at. Obviously with Tommy [Edman]'s uncertainty, Max [Muncy] coming back recently, having the extra infielder Hyeseong is huge," Roberts said. "And as far as how I'm going to use them, you know to run off the bench, to potentially take an at-bat off the bench, but there's a lot of lefties in that lineup. But Hyeseong, it's good to have him on the roster. And I feel he's going to help us out at some point."