The Moneyline MLB 30 in '30 series presents a forward-looking analysis predicting the 30 best players at each position for the 2030 season. This segment focuses on second basemen, a position where projections can often be complicated due to the fluidity of player movements, particularly as shortstop prospects evolve defensively or shift positions. Jackson Holliday serves as a prominent example, having been drafted and developed as a shortstop before transitioning to second base at the major league level.

While evaluating a player's potential over the next five years entails examining both offensive and defensive capabilities, it remains a largely subjective endeavor grounded in projection. This article also acknowledges notable veterans who may no longer be in the conversation for top second basemen by 2030, due in part to age and performance regression. The following players have been excluded from the rankings due to the anticipated impact of aging on their careers: Ozzie Albies (33, ATL), Jose Altuve (40, HOU), Jake Cronenworth (36, SD), Jose Iglesias (40, SD), Brandon Lowe (35, TB), Ketel Marte (36, ARI), Jeff McNeil (38, NYM), and Marcus Semien (39, TEX).

Nonetheless, the landscape of second base shows promising talent, with emerging players highlighted in the following rankings. Starting with Termarr Johnson of the Pittsburgh Pirates, projected to be 26 years old in 2030, he was the No. 4 overall pick in the 2022 draft, recognized for a 70-grade hit tool that has not yet fully manifested in the minors. Despite a .237/.366/.386 hitting line with 35 extra-base hits as a 20-year-old, Johnson remains a player to watch closely in the coming years.