Miller-Green spent the last two seasons in the Chicago White Sox organization after being selected in the 17th round of the 2024 MLB Draft. He appeared in 19 games with Low-A Kannapolis in 2024 and returned there in 2025, playing 71 games while batting .263. He also saw time with High-A Winston-Salem, making 28 appearances.

A highly decorated collegiate player, Miller-Green played at George Mason, Chipola College, Oklahoma State, and Austin Peay. In 2024, he earned multiple First Team All-America honors after slashing .393/.533/.900 with 30 home runs and 94 RBIs, while also being named ASUN Player of the Year. He also contributed on the mound during his collegiate career.