CHICAGO -- The Broncos opened the preseason with a 24-17 win over the Bears at Soldier Field in Chicago on Thursday night.
All the focus was on Broncos quarterbacks Trevor Siemian and Paxton Lynch as they continue to compete for the starting job.
Siemian got the start, but it was the defense that got the first score of the night.
On the first drive, Bears quarterback Mike Glennon was picked off by Chris Harris Jr., who took it the distance to give the Broncos a 7-0 lead just one minute into the game.
Siemian finished 6 of 7 passing for 51 yards after getting sacked on his first play. Siemian got all of the first-quarter snaps and one second quarter possession.
He led a drive that resulted in a 38-yard field goal from Brandon McManus in the first quarter to make it 10-0.
Lynch came in after that and his first two drives were three-and-outs.
Lynch was back in to start the second half and kicked things off with a 14-yard pass to Jordan Taylor on first down. The drive ended in another punt for the Broncos.
Lynch finished 6 of 9 for 42 yards.
Bears rookie quarterback Mitchell Trubisky looked more like a franchise quarterback as he led Chicago to a touchdown on his first drive before the half and then another scoring drive to open the second half to make it 14-10.
Trubisky continued to beat down the Broncos third-string defense early in the fourth quarter as the Bears marched down for a field goal to increase their lead to 17-10.
Trubisky was the second overall pick in the draft.
The first offensive touchdown for the Broncos didn't come until late in the fourth quarter when third-string quarterback Kyle Sloter finished his first drive with a 47-yard throw to Isaiah McKenzie, who was wide open, to tie it, 17-17.
It completed a seven-play, 64-yard drive. Sloter played quarterback at the University of Northern Colorado.
The Broncos' third-string offense continued to look good as running back DeAngelo Henderson ran 41 yards on third-and-long for a touchdown to make it 24-17.
Sloter finished 5 of 6 for 94. Lynch will start when the Broncos face the San Francisco 49ers in Santa Clara, California, on Aug. 19.