By KRISTIE RIEKEN
AP Sports Writer

HOUSTON (AP) - Rookie Drew Lock threw for 309 yards and three touchdowns and Kareem Jackson had an interception and returned a fumble 70 yards for a touchdown against his former team . The Denver Broncos built a huge first-half lead and coasted to a 38-24 win over the Houston Texans. Lock made his NFL debut in a win over the Chargers last week. He threw for 235 yards with three TDs in the first half for the most yards passing in a first half by the Broncos since Peyton Manning had 282 in Week 5 of 2014.

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