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Diamondbacks send Shelby Miller to the minors months after trading No. 1 pick for him

<p>PHOENIX, AZ - APRIL 10: Starting pitcher Shelby Miller #26 of the Arizona Diamondbacks reacts in the dugout during the first inning of the MLB game against the Chicago Cubs at Chase Field on April 10, 2016 in Phoenix, Arizona. (Photo by Christian Petersen/Getty Images)</p>

PHOENIX, AZ - APRIL 10: Starting pitcher Shelby Miller #26 of the Arizona Diamondbacks reacts in the dugout during the first inning of the MLB game against the Chicago Cubs at Chase Field on April 10, 2016 in Phoenix, Arizona. (Photo by Christian Petersen/Getty Images)

The Arizona Diamondbacks' trade for Shelby Miller looked a bit worse Thursday, when the club announced it sent the struggling right-hander to Triple-A Reno (Nev.).

#Dbacks option right-handed pitcher Shelby Miller to the Triple-A Reno @Aces. A corresponding move will be made tomorrow.

— Arizona Diamondbacks (@Dbacks) July 14, 2016

In December, the Diamondbacks sent the No. 1 pick in the 2015 draft -- shortstop Dansby Swanson -- along with 2014 first-round pick Aaron Blair and center fielder Ender Inciarte to the Braves for Miller, who went 6-17 with a 3.02 ERA in 2015.

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The deal was heavily criticized at the time and it appears for good reason. Miller has struggled mightily his first season in Arizona, going 2-9 with a 7.14 ERA. Miller has given up at least five runs in six of his 14 outings this year.

After making some flashy moves this offseason --€ signing Zack Greinke to a six-year, $206 million contract -- the Diamondbacks were expected to contend in the NL West. Instead, Arizona is sitting in last place in the division at 38-52.