Competition continues as Trevor Siemian starts preseason opener

Siemian seems to lead Lynch in Denver QB battle (0:43)

Jeff Darlington breaks down the latest on the Broncos' quarterback competition between Trevor Siemian and Paxton Lynch. (0:43)

ENGLEWOOD, Colo. – Every throw at every practice is scrutinized each day as part of the competition at quarterback between Trevor Siemian and Paxton Lynch. Here’s a closer look at their Monday:

Trevor Siemian

Siemian opened with the starting offense, and after practice coach Vance Joseph said Siemian would start Thursday’s preseason opener in Chicago. Joseph added that the competition between the two quarterbacks is still very much underway and that "I want to see the [preseason] games."

Wow moment: The Broncos went into their indoor practice facility because of the weather, and Siemian showed his arm strength with several throws from the hashmark to the far sideline -- on both sides of the field -- during the workout. But the best play of his day came with plenty of help from wide receiver Demaryius Thomas, as Siemian put the ball high to the outside shoulder, out of the reach of the defender, and Thomas tipped it one-handed, back to himself, and made the catch.

Whoa moment: Siemian threw the only interception in 11-on-11 work when wide receiver Jordan Taylor fell down just before the ball arrived. Cornerback Lorenzo Doss swooped in for the pick and likely would have returned it for a touchdown.

Paxton Lynch

Overall, it took Lynch some time to settle into the workout, as he struggled with his accuracy in the first few team periods. But things went a little better in the second half of practice. Joseph said Lynch would get the start in the second preseason game in San Francisco, which is what the Broncos already had planned.

Wow moment: Lynch squeezed a ball into a tight spot when he found tight end A.J. Derby for a catch in traffic along the right sideline. Lynch also had a high-quality toss to Emmanuel Sanders late in practice.

Whoa moment: Lynch held the ball too long and took what would have been sacks in a real game -- one on a third-and-3 play and another in the red zone. Later, he threw the ball away on a fourth-down red-zone play (according to the down marker) in a situation in which the offense needed a touchdown.