A major prospect-for-ace swap hits right before showtime.

On today’s Baseball Insiders Prospect Edition, Adam Weinrib and Fansided prospect guru Eric Cole break down the stunning trade that sends Sonny Gray from the Cardinals to the Boston Red Sox, with Boston surrendering high-octane lefty Brandon Clark and swingman Richard Fitts in the deal.

Gray brings All-Star pedigree — but is he truly the Red Sox’ No. 2 starter? And did Boston just part with a future monster arm in Clark? We dig into the reliever risk, the upside, and what this move signals about Boston’s real offseason intentions.

PLUS: The guys revisit the Mets–Rangers Brandon Nimmo ↔ Marcus Semien blockbuster and how it reshapes both systems — including Carson Benge, Jet Williams, Cody Freeman, and more.

The Rangers are blowing it up, sending Marcus Semien to the Mets in a shocking trade for Brandon Nimmo — with money changing hands on both sides. Adam Weinrib and Robert Murray break down who wins the deal, how it reshapes both rosters, and whether the Mets could pursue Kyle Tucker next to fill their outfield gap.

They also discuss the Rangers’ offseason teardown, the markets for Adolis García, Jonah Heim, and Josh Sborz, and which non-tender decisions caught them by surprise. Plus: the latest on Ramon Urías’s sudden exit from Houston, and why Ryan Helsley might be attracting interest as a potential starter.

It’s Non-Tender Deadline Day, and the offseason is officially in full swing. The guys break down a chaotic week across the league, starting with the Braves dominating the transaction wire and ending with major questions about Corey Seager, the Pirates, and the Yankees’ outfield plans.