An interesting comp for Marcelo Mayer might be Seattle second baseman Cole Young, who had 1,473 plate appearances at the minor league level. Injuries limited Mayer's plate appearances over five minor league seasons while Young, who is seven months younger than Mayer, played in only four seasons in the minors.
Mayer and Young were first-round picks as lefthand-hitting shortstops out of high school in 2021 and 2022 although they are now starting second basemen for American League clubs expected to contend in 2026.
Mayer made his MLB debut in May 2025 one week before Young made his MLB debut. Last year Mayer posted an OPS+ of 87 and 0.2 bWAR in 44 games before an injury ended his season while Young posted an OPS+ of 76 and 0.5 bWAR in 77 games.
This year Mayer has posted an OPS+ of 97 and 0.2 bWAR in 27 games while Young has posted an OPS+ of 124 and 1.8 bWAR in 32 games. Young, who leads the league in Defensive Runs Saved, is on pace for an unlikely 9 bWAR season.
Seattle shortstop J.P. Crawford is expected to test free agency after this season but Young is likely to remain at second base as top prospect Colt Emerson is projected to take over at shortstop in 2027.