Seattle Mariners shortstop prospect Colt Emerson has agreed to an eight-year, $95 million extension, the largest contract in MLB history for a player with zero major league service time, sources confirmed to ESPN on Tuesday. The deal can reach a maximum value of $130 million and includes a ninth-year team option and a full no-trade clause.

Emerson, 20, remains at Triple-A Tacoma, where he is hitting .357 with a home run through his first three games. He is ESPN's sixth-ranked prospect heading into 2026.

The left-handed hitter was Seattle's 22nd overall selection in the 2023 draft out of an Ohio high school. Last season he slashed .285/.383/.458 with 16 home runs and 78 RBIs across three minor league levels.

Scouts project Emerson as a 20-home run threat with an above-average on-base profile and reliable shortstop defense. A strong spring training, .268/.340/.488 with two home runs, accelerated confidence in his defensive capabilities at the position.

Emerson is widely expected to replace J.P. Crawford as Seattle's everyday shortstop in 2027, when Crawford enters free agency.

The extension adds Emerson to a growing core of players under long-term agreements. Julio Rodriguez is signed through 2034, Cal Raleigh through 2030, and Josh Naylor through 2030.

The agreement arrives one day after the Milwaukee Brewers reportedly locked up shortstop prospect Cooper Pratt to an eight-year, $50.75 million deal.