Rookie Ryan Tannehill is officially the Miami Dolphins' starting quarterback, ending one of the league's preseason QB races in time for two more preseason games:

Philbin has announced that Ryan Tannehill has been named the starting quarterback

— Miami Dolphins (@MiamiDolphins) August 20, 2012

Tannehill earned the job through both performance and circumstance, outplaying rival Matt Moore and advancing in part because of the knee injury to David Garrard. The Phinsider reports that the move has been all but official for a while judging by the team's actions (namely Tannehill taking the majority of the snaps with the starters after Garrard's injury).

The rookie's first task will be against the Atlanta Falcons at Sun Life Stadium Friday night. Tannehill will be the first rookie quarterback to start for the Dolphins since Dan Marino, and creates a record four rookie starting QBs in one season (Andrew Luck, Robert Griffin III and Brandon Weeden).

For more on the Miami Dolphins, visit The Phinsider. Atlanta Falcons news can be found at The Falcoholic, and all your NFL info is available at SB Nation's NFL page.