The Jets announced the decision Thursday, a day after coach Rex Ryan said rookie Geno Smith had a “brutal” practice in what was his “worst day” of training camp. Smith is also dealing with a sprained right ankle.
QB decision made for this weekend: Mark Sanchez will start vs. Jacksonville.
— New York Jets (@nyjets) August 15, 2013 
Sanchez started the preseason opener at Detroit last Friday. Ryan says the plan against the Jaguars is not necessarily an indication of which quarterback leads in the tightly contested competition.
Sanchez has had a solid week of practices, while Smith threw four interceptions Wednesday, including three in 11-on-11 team drills.
The Jets break camp at SUNY Cortland on Thursday.
Source: Associated Press