"He played good," Wannstedt said. "He's probably as confident as he's ever been since he's been here."
Fletcher's interception in the third quarter set up Miami's final touchdown, a 1-yard run by Robert Edwards.
The interception came with Fletcher in zone coverage when David Carr's pass went through the hands of intended receiver Corey Bradford.
The sack came when Fletcher forced Carr out of bounds as the quarterback was scrambling out of the pocket.
Not all was perfect for Fletcher, who gave up a couple of receptions in the second half.
But Wannstedt was quick to give Fletcher a vote of confidence when he was asked if Fletcher had earned his trust this summer: "Yes. I think he's been very consistent. I'm confident and I think the team is confident that when he's called on he'll step up and get the job done."