In 2008, Symmonds won the United States Olympic Trials 800m final held in Eugene, Oregon with a personal best time of 1:44.10. He was the first of three Oregon associated athletes to finish at the top of this race before the home crowd, the other two being Andrew Wheating from the University of Oregon and Oregon Track Club training partner Christian Smith, an event referred to as the "Oregon sweep" and replayed many times in television coverage of the meet. This qualified him (and all three) for the U.S. Olympic Team for the 2008 Summer Olympics in Beijing, China, for the 800 m race. At the Beijing Olympics, Symmonds won his first-round heat, then finished a non-qualifying fifth place in his semifinal heat with a time of 1:46.96, 0.73 seconds behind the winner of that heat.