CHICAGO (AP) -- Ryan Tannehill picked apart a rebuilt defense, throwing for a touchdown on the game's opening drive, and the Miami Dolphins led into the second half before the Chicago Bears rallied for a 27-10 victory in the preseason opener Thursday night.
The Bears used two interceptions by reserves to set up a touchdown and field goal that gave them a 10-point lead early in the fourth quarter.
The rally aside, it was not a promising performance by a team coming off a five-win season. The Bears hired general manager Ryan Pace and coach John Fox while overhauling the defense, but there clearly is work to do.
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Miami, 8-8 last season, looked good until Chicago's reserves made their move.
Tannehill, armed with a $96 million contract extension, played like a big-money quarterback, going 6 of 7 for 56 yards. He threw a 2-yard touchdown to Jarvis Landry to finish an 85-yard drive and called it a night.
Prized free-agent signing Ndamukong Suh did little, but a defense the Dolphins believe can dominate sure looked the part.
The first-teamers shut down Jay Cutler and the rest of the Bears' starters on the first possession. Chicago started moving on its second drive, which ended with a 48-yard field goal by Robbie Gould against a mix of starters and reserves.
Cutler played two possessions and threw for 42 yards, going 4 of 7. He did not commit a turnover after leading the league with 24 last season.
Jimmy Clausen played until the closing minutes and was 17 of 27 for 151 yards. Jacquizz Rodgers started in place of Matt Forte and ran for 33 yards on seven carries.
Ka'Deem Carey scored on a 1-yard run late in the third period that gave Chicago a 17-10 lead and finished with 34 yards rushing. Senorise Perry ran for a 54-yard TD late in the game.
A defense that ranked among the worst in franchise history the past two years gave no indication a quick turnaround is coming. The Bears, switching from a 4-3 to 3-4 scheme under Fox and new coordinator Vic Fangio, quickly fell behind.
The Dolphins overcame two holding penalties and burned 8:01 on that opening touchdown drive.
Tannehill was nearly intercepted deep in Chicago territory by Jared Allen, who reached out and knocked down a pass. But Landry's TD gave Miami the lead.