Although his career got off to a slow start due to the lost 2020 season and an elbow surgery in 2021, the righty quickly established himself as a legitimate big league bullpen arm after pitching to a 1.57 ERA and 3.04 FIP over the last two minor league seasons. His pitches are a little difficult to classify; what Pitch Info calls his slider, Baseball Savant calls a sweeper, and what Baseball Savant calls a slider, Pitch Info calls a cutter. Regardless of what you call it, however, his cutter/slider is a true weapon. He threw it about 38% of the time in 2023, holding big league batters to a .139 wOBA and .217 xwOBA. The pitch modeling systems agree that it’s a plus pitch, and combined with his high-spinning four-seam fastball, which sits 95 and tops out at 97.4 mph, Campbell has what it takes to hold down a spot in Boston’s bullpen. The Red Sox have some solid arms at the back end of their ‘pen, but they need depth, and this move helps to accomplish that goal.