Athletics blockbuster fires warning shot at Mariners, AL West with relocation looming

Athletics v San Diego Padres | Chris Bernacchi/GettyImagesThe Athletics just did the Seattle Mariners a solid by removing one of baseball's best closers from the AL West. But come the A's inaugural season in Las Vegas in 2028, the Mariners and the rest of the division may come to regret it.

For anyone who hasn't yet heard, Mason Miller is on his way with JP Sears to San Diego to join the Padres. Jeff Passan of ESPN was the first to report on a massive deal between the two sides, with four prospects headlining the return for the Athletics.

This is a ridiculous haul from the perspective of the A's. Leo De Vries is ranked by MLB Pipeline as the No. 3 prospect in all of baseball, while Braden…