PITTSBURGH (AP) – Ben Roethlisberger threw for 311 yards with two touchdowns and an interception and the Pittsburgh Steelers fended off a spirited comeback by the Denver Broncos 26-21. The Steelers (2-0) knocked out Denver starting quarterback Drew Lock in the first quarter with a right shoulder injury but didn’t secure the win under safety Terrell Edmunds sacked Broncos backup Jeff Driskel on fourth-and-2 with less than two minutes to go. Driskel completed 18 of 34 for 256 yards with two touchdowns and a pick and absorbed a serious pounding at the hands of Pittsburgh’s defense.