Part was defeated in the first round of the 2009 World Championship, losing 3–0 to American Bill Davis – the second time in which Part has lost his first match in the World Championship, having won the title the previous year (he was knocked out by Mark Dudbridge in 2004 having won the title in 2003). Part was defeated by Kirk Shepherd in the second round of the 2010 World Championship in a repeat of the 2008 final, only recording a 76 average in a 4–1 loss. This result meant Part dropped down the rankings and did not appear in the 2010 Premier League.