Steadied by Sam Darnold, USC increasingly no stranger to second-half comebacks

LOS ANGELES — It has been a recent phenomenon.
In three of USC’s past four victories, stretching to last January’s Rose Bowl win, its offense has been forced to overcome late deficits.
Against Penn State? The Trojans trailed by 14 points entering the fourth quarter.
In this season’s opener against Western Michigan? They fell behind by a touchdown in the third quarter.
Last Saturday against Texas? They were down by three points, before mounting a final drive to force overt