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Cody Ross and Jason Kubel have been disappointments this season.
Find A Reliable Closer
Neither Heath Bell nor J.J. Putz have been effective in the ninth inning for Arizona, pitching to a combined 4.54 ERA and 1.58 WHIP and blowing eight saves along the way.
With multiple closers and relievers with closing experience expected to be available—including Miami's Steve Cishek and Chicago's Kevin Gregg—Arizona shouldn't have much trouble landing a ninth-inning upgrade despite facing some stiff competition for the best options available.
Bolster the Starting Rotation
After Patrick Corbin, Arizona's starting rotation has been, well, pretty awful this season:
| ||W-L ||ERA ||WHIP
|Patrick Corbin ||9-0 ||2.22 ||1.00
|Randall Delgado ||0-2 ||4.05 ||1.50
|Wade Miley ||4-7 ||4.29 ||1.45
|Trevor Cahill ||3-10 ||4.66 ||1.41
|Brandon McCarthy ||2-4 ||5.00 ||1.43
|Ian Kennedy ||3-4 ||5.36 ||1.35
|Tyler Skaggs ||1-1 ||5.40 ||1.38
Ian Kennedy continues to regress, Daniel Hudson just underwent a second Tommy John surgery and Brandon McCarthy's recovery from an inflamed right shoulder has been slow.
Tyler Skaggs has been unimpressive in the few starts that he's made, and while top prospect Archie Bradley isn't far off from making an impact in the major leagues, the Diamondbacks clearly don't want to rush him.
Fox Sports' Ken Rosenthal reports that the Diamondbacks are not interested in a rental, like the Chicago Cubs' Matt Garza, and have instead set their sights on younger arms who can be part of the team's long-term future, like Garza's teammate, Jeff Samardzija, and Milwaukee's Yovani Gallardo.
Arizona certainly has plenty of prospects with which to facilitate a deal for one or the other, but unless general manager Kevin Towers is willing to part with some of the team's best prospects—including Bradley—it's hard to see the team landing the type of arm its looking for.
Upgrade Corner Spots in the Outfield
Neither Jason Kubel nor Cody Ross has been able to deliver at the plate for Arizona this season, hitting a combined .257 with eight home runs and 46 RBI on the season.
That's not good, and it's why the Diamondbacks have been scouting Chicago's Alex Rios extensively, as reported by ESPN Chicago's Bruce Levine. Rios, hitting .268 with 11 home runs and 36 RBI on the season, has almost exceeded the aforementioned duo's production by himself this season.
With Arizona holding a team option on Kubel for next season, acquiring a player with multiple years left on his contract wouldn't create a logjam in the outfield going forward.