Riley O'Brien's Calf Soreness Under Evaluation, WBC Status Unclear

St. Louis Cardinals pitcher Riley O'Brien is managing calf soreness, which is currently being evaluated. The injury puts his availability for Team South Korea in the upcoming World Baseball Classic in question. O'Brien, who recorded six saves, six holds, a 2.06 ERA, 1.15 WHIP, and a 45:22 K:BB over 48 innings last year, is expected to contend for saves with the Cardinals to start the 2026 season. The exact cause of the injury remains unclear.