Roman Anthony’s complicated, groundbreaking extension with the Red Sox is official — and its value will largely be determined by how he performs over the next decade.

Anthony, the No. 1 prospect in baseball entering this year, signed a long-term contract extension on Wednesday

Roman Anthony and the Boston Red Sox have agreed on a contract extension that will keep the star rookie the face of the franchise for nearly a decade. The Red Sox signed the outfielder to an eight-year contract extension that spans the 2026-33 seasons,