Lamar Jackson got off to a slow start.
He completed only one of his first six attempts for 12 yards.
Jackson, though, got hot in the second quarter. His two touchdown passes have the Ravens out to a 14-0 halftime lead on the Texans.
Jackson also has six runs for 45 yards.
The Ravens had chances to score on two other possessions in the first half, but Justin Tucker missed a 43-yard field goal, hitting the upright, and then the Texans tackled Andrews for a 2-yard loss on a fake field goal attempt on fourth-and-two from the Houston 37.
Four of the Texans’ five drives crossed midfield. They lost a fumble, turned it over on downs when they didn’t get a blatant pass interference penalty on Ravens defensive back Matt Judon on receiver DeAndre Hopkins, punted and Ka'imi Fairbairn missed a 43-yard field goal with time running out in the first half.
Watson went 10-of-15 for 102 yards, and Hopkins has five catches for 43 yards.