Are the last-place Arizona Diamondbacks considering a front office overhaul?

Bob Nightengale of USA Today reports D-backs owner Ken Kendrick and president Derrick Hall may be looking to replace chief baseball officer Tony La Russa as well as general manager Dave Stewart and assistant GM De Jon Watson.

Nightengale cites a high-ranking executive who says the D-backs are "considering firing the trio." If Stewart is dismissed, it would mark the seventh time in 11 years that the D-backs would change general managers. Stewart has a contract option for 2017 that must be exercised or declined by Aug. 31, while La Russa's contract expires after the season.

Following a busy offseason in which they signed star pitcher Zack Greinke to a $206 million contract, the D-backs are last in the National League West with a 51-73 record. The organization has faced a torrent of criticism of late, with ESPN's Keith Law writing it is time to end the "Reign of Error" in Arizona.

Nightengale also reports the Diamondbacks had a deal in place that would have sent Shelby Miller to the Miami Marlins prior to the Aug. 1 deadline, only to watch Arizona ownership get a case of cold feet.

Arizona ownership apparently balked, given the huge price they paid to the Atlanta Braves for Miller, a deal that included prized shortstop prospect Dansby Swanson. After posting a 3.02 ERA for the Braves last season, Miller has endured a stunningly poor season in Arizona, posting a 2-9 record with a 7.14 ERA and a 1.75 WHIP.