Diamondbacks option struggling 3B Emmanuel Rivera to Reno

(Photo credit: Matt Kartozian-USA TODAY Sports)
The Arizona Diamondbacks demoted slumping third baseman Emmanuel Rivera to Triple-A Reno.

Rivera, who is hitless in 19 at-bats in August, was told of the move after Friday's 10-5 loss to the San Diego Padres.

Infielder Buddy Kennedy was recalled from Reno on Saturday in a corresponding move.

Rivera, 27, has been the starting third baseman with Evan Longoria (back) on the