Pitching for Class A Potomac on Friday night in his first rehab start as he nears a return from left shoulder inflammation, Gio Gonzalez allowed eight runs on seven hits — including a grand slam — while walking four and hitting a batter against the Wilmington Blue Rocks. Despite the rough outing — and results matter less on rehab assignments — Gonzalez said his shoulder feels good.

“It’s definitely a work in process going from spring training to building it up to shutting it down and then going back at it again,” said Gonzalez, who is on the disabled list for the first time in his seven-year major league career. “To make the wheels go, you’ve got to crank them up and try to find where you’re at. It’s just good to know that my body feels good and my arm feels good.”

Gonzalez, who has been on the disabled list since May 18, said his shoulder felt “really good.” His first two innings were strong as he induced five groundouts and struck out one. But his command wavered in the third and fourth innings. All four walks were on four pitches. He gave up the grand slam in the third inning and couldn’t get out of the fourth, leaving with two outs and at 65 pitches, his predetermined limit. He threw 34 strikes.