Competing at the 2008 US Olympic Trials in Eugene, Oregon, Dix qualified for the 2008 Summer Olympics in both the 100 and 200 m events. After recording a personal-best-equaling 9.93 seconds in the 100 m semifinals, he took second place behind Tyson Gay with a wind-assisted 9.80 seconds. He stated that his NCAA experience had helped raise his confidence and that he was less nervous than he was at the 2005 US Championships. The 200 m favorite Gay suffered an injury in the qualifying rounds, and Dix and Crawford both finished the 200 m final with 19.86 seconds, with Dix elected the winner by a photo finish. After signing a sponsorship deal with Nike worth around $1,000,000 a year, described by his agent as "the largest deal ever for a track athlete just coming out of college", Dix stated that his aims for the Olympics were personal bests in the individual sprints and a gold in the relay race.