Zambrano leaves with back soreness

Cubs pitcher Carlos Zambrano left Thursday’s start against San

Francisco in the second inning because of soreness in his lower

back and went for an MRI.

Zambrano had just thrown a ball to Eli Whiteside after an RBI

single by Miguel Tejada when he began stretching his back.

Trainer Mark O’Neal and pitching coach Mark Riggins rushed out

and manager Mike Quade followed. Marcos Mateo then relieved with

the Giants leading 1-0.

The Cubs went on to win 5-2 in 13 innings, with pinch-hitter

Geovany Soto’s three-run homer capping a four-run rally.

Zambrano has struggled at times this season but had been

pitching well of late, going at least seven innings in his previous

two starts against the White Sox and Kansas City.