Tannehill became the first QB selected in the opening round by the Dolphins since 1983, when they drafted Dan Marino.
Tannehill might have been a reach at No. 8. He started just 19 games in college after switching from receiver to quarterback, and last year he went only 1-4 against Top 25 teams.
Since Marino retired following the 1999 season, they've started 16 quarterbacks, the most in the NFL. The incumbent is veteran Matt Moore, who exceeded expectations starting the final 12 games last year.