Jared Hughes

Arrieta strikes out 11, Rizzo drives in 4, Cubs beat Pirates

Jake Arrieta regained his form right after Anthony Rizzo's towering drive landed in the bleachers in right field.

The unbeaten ace took over from there.

Arrieta struck out 11 in eight innings, Rizzo drove in four runs and the Chicago Cubs remained perfect against the Pittsburgh Pirates with an 8-2 victory on Saturday.

Arrieta improved to 18-0 with a microscopic 0.75 ERA in 20 regular-season starts since Aug. 1. The Cubs have won his last 21 starts, extending a franchise record.

"It's unusual," manager Joe Maddon said with a chuckle. "It's very unusual what he is doing."

Arrieta (7-0) allowed three hits and two runs, leaving with a...