What happened: MLB Network insider Jon Heyman said the chances Detroit Tigers ace Tarik Skubal is traded are "excellent," putting the odds at 90 percent. The comment, aired by MLB Network, is the strongest public signal yet that the reigning-form left-hander could be on the move before the deadline.

Why it matters: Skubal is the most coveted arm on the market, and a 90 percent characterization from a plugged-in reporter reframes his situation from speculation to expectation. Detroit's standing has fueled the chatter, as the Tigers have owned MLB's worst record since Skubal's final start on April 29, pushing the front office toward a sell-side decision.

What to watch: Watch whether Detroit's play over the next several weeks closes the gap in the standings or hardens the sell case. Any movement in the field of suitors or a firmer asking price would be the next tell on timing.