On July 20, 2012, Jager broke the American record in the 3000 m steeplechase, running 8:06.81. On August 5, Jager competed in the Olympics, finishing 6th in the final. After the Olympics, on August 17, Jager ran a new personal best of 7:35 in the 3000 m at the Stockholm Diamond League meet, finishing 5th.