Giannini finished second overall in the decathlon at the All-Atlantic Region Championship hosted by Williams College on Wednesday, May 14 and Thursday, May 15. Giannini finished with a personal-best score of 6,446, which moved him into 25th nationally in Division III. He was the top finisher in the 100-meter dash and long jump and was the runner-up in the javelin throw. It is Giannini’s second E8 weekly honor of the 2025 season.