What happened: The Yankees, Rays, Phillies and Red Sox round out the five-club group expected to press hardest for upgrades. Rival executives believe Los Angeles would pursue Tarik Skubal if Detroit makes him available, while New York is seeking catching, bullpen and lineup help.

Why it matters: Los Angeles is chasing a third consecutive World Series title, while Tampa Bay sees an opening in the American League race. Detroit's willingness to entertain offers for Skubal could shape the market for multiple contenders.

What to watch: Watch whether Detroit makes Skubal available and whether the Yankees turn their catcher and bullpen searches into deals.