Schaub played most of the first quarter for Houston (2-0) and got off to a rough start, throwing an interception on his first series and being sacked on third down on the second. He and the offense got going on the next drive, and he found tight end Owen Daniels wide open in the end zone for a 15-yard touchdown play to put the Texans ahead 7-0.
Case Keenum took over after that and was 11 of 18 for 150 yards with a 38-yard touchdown pass. T.J. Yates finished the game and was 7 of 9 for 84 yards, including a 33-yard touchdown throw to Garrett Graham in the third quarter. The solid performance by both players didn't bring any clarity in the battle to backup Schaub.
"TJ's solid again, Case makes some really nice throws in there," Kubiak said. "The easy way for me to answer that is to say they're both doing their jobs. They're making it really hard on me, and that's a good thing for our team."
"I don't think we played as clean as have to," coach Joe Philbin said. "Offensively, it took us a while to get going. We did some good things, but there's a lot of room for improvement."
Tannehill wanted to use this game to develop chemistry with Wallace, who joined the Dolphins in the offseason after four years in Pittsburgh. He did that, connecting with Wallace three times for 58 yards, including a 9-yard touchdown pass that tied the score at 7 in the first quarter.
"It was great for us," Tannehill said. "I think our relationship continues to grow; we continue to be more on the same page the more reps we can practice. It was exciting to get a couple of balls to him and hopefully get his ball rolling."
But the Dolphins' offense took a blow when new tight end Dustin Keller sustained what appeared to be a serious right knee injury. Keller's leg bent unnaturally when he was tackled on the right knee by D.J. Swearinger on an incomplete pass Saturday night. Keller immediately grabbed his right knee and soon was carted off the field.
Philbin said he didn't have a diagnosis on Keller's injury, but Wallace was preparing for the worst.
"It looked pretty bad, and I'm pretty sure he's going to be out for a while," Wallace said, adding that he hadn't heard anything official on Keller's status.
Kubiak said he wasn't sure how Hopkins was injured, but he saw him looking disoriented on the field.
"He didn't run the route, didn't get his depth, was just stumbling all over the place," Kubiak said. "So we got him out.
Texans star linebacker Brian Cushing returned Saturday for the first time since a knee injury ended his season in Week 5 last season and played 10 snaps. He had a tackle and came close to a sacking Tannehill, lunging at him and grabbing his midsection before the quarterback wriggled away on Cushing's final play.
"I'm proud of him," Kubiak said. "For him to go out there and get hit on and stuff like that was a big step."
Randy Bullock, who missed all of last season with a groin injury, gave Houston a 17-14 lead just before halftime with a 46-yard field goal.
Notes:Texans safety Shiloh Keo injured his calf and safety Eddie Pleasant injured his knee in the first half, and neither returned. ... Jean's 38-yard touchdown reception was the longest catch by a Texan this preseason. ... These teams have seven players combined who played at Texas A&M, led by Tannehill.
Copyright 2013 by The Associated Press