 Complete the following phrase:  At the start of 2008 he won the 60 m sprint at the Tyson Invitational, but had a poor performance at the 2008 IAAF World Indoor Championships, being eliminated in the heats after a slow start. He competed in only two competitions over 100 m that year: he was a semi-finalist at the Jamaican National Championships and was seventh in the 100 m at the 