PHOENIX -- The Diamondbacks' list of the walking wounded has added another victim.
Right-hander Juan Cruz was placed on the 15-day disabled list before Sunday's game against the Padres at Chase Field.
Cruz, 29, strained his left oblique throwing a pitch in the ninth inning to Adrian Gonzalez on Saturday.
Known for a somewhat violent delivery, the 145-pound Cruz has battled the oblique all season. He missed nine games at the end of June, and then after coming back for one appearance on June 28, Cruz missed another four games.
"It's still bothering him," D-backs manager Bob Melvin said. "We'll give him the 15 days and hopefully it will get us past this issue."
Cruz is 2-0 in 37 games this season with a 3.23 ERA. He has 46 strikeouts in 30 2/3 innings and he leads the Majors among relievers with a 10.83 strikeouts per nine innings ratio.
The D-backs called up right-hander Connor Robertson from Triple-A Tucson, just two days after he was sent down to make room for outfielder Alex Romero.
In Robertson's brief time with the D-backs, he threw four innings in relief, allowing two hits and one earned run.
Mike Ritter is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.