What happened: MLB Network's Jon Morosi identified five National League clubs whose buy-or-sell decisions could shape this summer's trade deadline: the Miami Marlins, Washington Nationals, Arizona Diamondbacks, Pittsburgh Pirates, and Cincinnati Reds. Each carries a credible case to add talent or to move pieces, leaving their direction unsettled as the deadline approaches.

Why it matters: These five sit in the murky middle where a hot or cold stretch tips the front office one way or the other, and their choices ripple across the league by setting the supply of available bats and arms. With the Marlins among the group, a cluster of NL teams refusing to commit can freeze the market until the picture clarifies.

What to watch: Watch how each club plays out the weeks ahead, with the Aug. 3 deadline as the marker; a run or a slide for any of the five could shift them firmly into buyer or seller mode.