4 trades I would make if I were Miami Marlins GM Kim Ng

The Marlins could use a boost in all 3 sections of the roster to compete in the postseason
Washington Nationals v Chicago Cubs
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Starting Pitching

The Miami Marlins fans know how good their rotation can be when they are at their best and how bad it can be when they are not.   Sending down Eury Perez to save his arm for a hopeful long future with the Marlins has had a huge impact to the rotation, and they need a solid starter who will eat innings and keep them in the game.  

The Marlins don’t need to go fishing for the top pitching talent for sale at the deadline as they are not in need of a star starter if the playoff rotation could be Alcantara, Perez, Luzardo, Cabrera.  Braxton Garrett could come out of the bullpen in long relief along with Cueto.  The Marlins just need a guy who will consistently go 6 or 7 innings and keep them in the game for the newly powered offense.  Jack Flaherty is that guy.  

Flaherty is a free agent at the end of the season so his price shouldn’t be too high, as he has been an average pitcher this season but would help with innings.  He is 7-6 with a 4.39 ERA and a 1.53 WHIP, not bad for a 5th starter for the Marlins.  He will certainly be able to take on the innings eater role, going at least 6 innings in his last four starts and has averaged 5.1 innings per outing this season.   The Cardinals want a pitcher with control for their future and Trevor Rogers could be dealt to fill that role but Flaherty is only a rental.  I would have to see how flexible the Cardinals would be and trade another arm to get him if possible.