2027 South Side Sox Top Prospect No. 91: Jonathan Clark

South Side Sox ranked right-handed relief pitcher Jonathan Clark as the No. 91 prospect in the Chicago White Sox system for 2027. The 26-year-old reliever, an undrafted free agent signed in 2025 following independent league stints, spent 2026 pitching across High-A Winston-Salem and Double-A Birmingham before finishing in the Arizona Fall League.

The writer argues that Clark is ranked too low on the list despite concerns regarding his advanced age relative to minor league competition. After reworking his pitching motion at Tread Athletics, Clark served as Birmingham's primary closer and is expected to open the 2027 season with Triple-A Charlotte.