Tune completed 12 of 18 passes for 119 yards and an interception in Sunday's 38-12 preseason loss to the Broncos.
The 2023 fifth-round pick got the start under center, and while he was fairly efficient, Tune led the Cardinals to just one Matt Prater 50-yard field goal in his five first-half drives. Desmond Ridder took over to begin the third quarter but left the game late in the fourth after taking a hit, and he was placed in the concussion protocol. With Ridder's availability for Week 1 now in question, Tune could begin the season as Kyler Murray's top backup.