Mason McGwire took a little time to get going, but now fully healthy, he's showing what intrigued the Cubs back in 2022. Flashing upper-90s velocity and an improved level of control, the righty has worked his way to South Bend and could see Knoxville by the end of the year. The downside here is clearly the injury risk, as his 45 IP so far in 2026 marks a new career high since turning professional. If he can remain healthy, there's mid-rotation (or better, if the secondaries develop) upside.