Carter scored his first 147 break on 29 April at the 2008 World Championship, one day after Ronnie O'Sullivan had made one in the same tournament. This made Carter the sixth man to achieve this feat at the Crucible (the eighth made there, as O'Sullivan had previously achieved it three times), and the first to have done so without previously winning a tournament. It is the first time two 147s have been made in the same event.