Chambers began the 2003 season with a grandiose statement – namely that he would lower the 100 m record to 9.65 s. After recovering from a minor injury he suffered in January, Despite claims he could also beat the 60 m indoor record, his form was poor and he failed to pass the heats at the 2003 British Grand Prix, finishing fourth in a time of 6.68 s. He was beaten by Mark Lewis-Francis by a hundredth of a second at the trials for the IAAF World Indoor Championships, narrowly missing out on selection with a time of 6.59 s.