Hartley pitched at the College of Central Florida, where he pitched in five games, giving up six earned runs over 16 innings pitched while recording 22 strikeouts. He previously committed to play next year at the University of South Carolina, which was one of two division one offers he had after this past year.

He pitched in the 2024 MLB Draft League. He throws a mid-90s fastball and a low-80s slider. He also throws a changeup and a curveball.

Unfortunately, he is currently rehabbing for Tommy John and has reopened his recruitment, so the Royals will look to have him pitch starting in 2026 at the professional level instead.