MESA, Ariz. (AP) — Jeff Samardzija made a strong spring debut and the Chicago Cubs scored four unearned runs in the first inning against San Francisco Giants ace Matt Cain, then held on for a 4-3 victory Sunday at HoHoKam Stadium.

Cubs catcher Dioner Navarro, acquired as a free agent during the winter, hit a three-run homer in the first inning after Alfonso Soriano hit a line drive off the right leg of Cain and reached first as the ball caromed away. Giants first baseman Brandon Belt made a throwing error one batter earlier.

"We were a little concerned," Giants manager Bruce Bochy said. "The knee started to swell a little bit. We were a little cautious with the knee. He wanted to get back out there, but we shut him down."