What happened: Arias finished his age-20 campaign with 25 home runs. Boston noted Anthony Rizzo in 2010 was the last prospect that young to reach 25.
Why it matters: Arias was named Eastern League MVP in Double-A after hitting .323 with a .957 OPS. The season finished with him ranked as MLB's No. 3 prospect.
By the numbers: Arias: .323 AVG, 25 HR, 91 RBI, .957 OPS. Last Boston prospect 20 or younger with 25 HR: Anthony Rizzo, 2010.
What to watch: Watch where Boston assigns Arias to open 2027 after his late-season promotion to Triple-A.