 Complete the following phrase:  Dix returned to national competition with an appearance at the 2010 USA Indoor Track and Field Championships. He took fourth place in the final and set a new 60 m indoor best of 6.58 seconds. Event winner Ivory Williams was disqualified after testing positive for marijuana and Dix was upgraded to third. He opened his outdoor season at the Seminole Twilight meet in May, recording 9.98 seconds in the 100 m and 19.89 seconds for the 200 m. He began to participate in Diamond League meetings, competing on the European circuit for the first time. He beat Wallace Spearmon at the Golden Galas 200 m race, breaking Michael Johnsons meet record. He also took to the national stage, winning the 100 m and finishing as the 200 m runner-up at the 