Seattle Mariners prospect Colt Emerson recently made history by signing a massive contract extension prior to making his Major League Baseball debut. This deal, reportedly worth eight years and $95 million, sets a new record for a player with zero service time.

Emerson's Historic Contract and Prospect Status

Emerson, a shortstop, was the Mariners' first-round selection as the No. 22 overall pick in the 2023 draft out of high school. He has experienced a rapid ascent through the minor leagues, reaching Triple-A Tacoma.

Timeline for MLB Debut

The highly-rated prospect is currently projected as the Mariners' starting shortstop for the 2027 season. However, there is a strong possibility he could receive a call-up to the major leagues as early as this current year.

Before signing the extension on Tuesday, Emerson had already performed well in Triple-A. In his first three games of the 2026 season for Tacoma, he posted a 5-for-14 batting line, which included one home run.

Comparing Baseball's Largest Pre-Debut Extensions

Emerson's $95 million base value surpasses previous record-holders for extensions signed by top prospects before their MLB debuts. Here is a look at some of the largest contracts signed under similar circumstances.

Luis Robert Jr.

The Chicago White Sox signed Luis Robert Jr. to a significant big-money deal in 2019, which initially appeared to be a major coup for the team. Robert earned second-place votes in the 2020 AL Rookie of the Year voting and secured a Gold Glove award in center field.

Despite his strong start, Robert's production and health have fluctuated significantly. He played only 166 combined games across the two seasons following his rookie campaign before an All-Star appearance in 2023, only to miss 114 games over the subsequent two seasons.

Eloy Jimenez

Eloy Jimenez also signed a major extension with the White Sox in 2019. Like Robert, Jimenez struggled to maintain consistent health and production levels following his initial contract signing.

Jimenez won a Silver Slugger award in 2020. However, after his 2019 rookie season, he only managed to play 100 games in a season once. He has since moved to several different organizations.

Victor Chourio

Milwaukee Brewers outfielder Victor Chourio previously held the record that Emerson has now surpassed in terms of base value. Chourio was the No. 7 prospect in baseball before signing his deal.

Chourio, who was drafted in the sixth round in 2023 out of high school, quickly established himself as a star. At just 22 years old, he finished third in the 2024 Rookie of the Year voting and hit 21 home runs in each of his first two MLB seasons.