The John Fox era began Thursday night at Soldier Field.
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.
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.
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.