The White Sox lock up Yoan Moncada through his age 30 season with a deal worth $70 million to $90 million depending on the options exercised. He jumped from 2.1 fWAR in 2018 to 5.7 fWAR in 2019, his seasonal age 24 season. This deal locks him up through his prime at a price that provides plenty of residual value to the White Sox if he averages a bit under two WAR a season.

The White Sox are doing a great job of locking up their core:

Rick Hahn and the White Sox have unveiled a certain strategy — extending players through their age-30 seasons — and that’s not a coincidence, despite all four major extensions (Eloy Jiménez, Luis Robert, Aaron Bummer Moncada) being for young players.

SouthSideSox.com

This is how Cleveland built their great team of the 1990s. It allows teams to capture the best years of a player at a reasonable price. It also allows teams to trade players in the future and get good value, as the contracts are reasonable to assume.