TUCSON, Ariz. -- For the second consecutive day, Justin Upton went to the D-backs' Minor League complex on Saturday to get extra at-bats.

Upton has struggled at the plate this spring, hitting .190 in 42 at-bats, and D-backs manager Bob Melvin thought a couple of days without the pressure of playing in a regular game would help Upton work out the kinks.

"I think for the most part, it's been a timing thing," Upton said.

The tough start to the spring has frustrated Upton, who does not get down on himself when he struggles, but rather gets angry.

"I have high expectations for myself," Upton said. "It's just frustrating because you want to be successful. I feel like I'm dealing with it pretty well."