 Complete the following phrase:  Coming into 2008, despite being among the most prolific sub-50 second 400-meter sprinters of the decade, Richards-Ross had yet to win any individual world or Olympic title. Up until then, the young athlete had run a total of 27 races below the 50-second barrier. After winning the 2008 U.S. Olympic trials, Richards-Ross was favored to win gold at the 