Getty Kyle Harrison pitches against the Rockies on June 10, 2025. On Tuesday September 2, 2025, Worcester Red Sox insider Tommy Cassell reported former San Francisco Giants top pitching prospect Kyle Harrison is being called up by the Boston Red Sox .  Kyle Harrison is leaving Polar Park with his bags packed. He’s headed up to Boston. — Tommy Cassell (@tommycassell44) September 2, 2025 Harrison, 24, is expected to make his first career Red Sox start on Wednesday September 3, 2025 when the Red