In 39 at-bats this month, Parra has just six hits and is batting .154. He hit .305 in April, .311 in May and .288 in June.
"It'll be good for him, just because of the way he plays," D-backs manager Kirk Gibson said. "The one against the Mets, it's like he got in a car accident. He sacrificed himself. He's just beat up so I made that decision. If you look at the numbers, you might figure it out."
Asked whether Parra will sit again Sunday in the club's final game before the All-Star break, Gibson replied, "I don't know, we'll see."
Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.