Jackson Holliday arrived in the majors as one of the most hyped prospects in recent memory, entering as the consensus No. 1 overall prospect in baseball and the son of seven-time All-Star Matt Holliday. He made his long-awaited MLB debut on April 10, 2024, at Fenway Park against the Boston Red Sox, driving in a run as the Orioles rallied for a 7-5 comeback win. This baseball was game-used during that historic debut, hand-signed by Holliday and featuring "GU 4-10-24" and "MLB Debut" inscriptions commemorating the milestone. As a limited edition numbered 1 of just 10, this piece stands as a rare and meaningful collector's item marking the beginning of Holliday's big league career.