Novak Djokovic needs to retire in the US Open tournament to complete the "retirement Slam".
He retired in 2007 Wimbledon semi-finals vs. Nadal, 2009 Australian Open QF vs. Andy Roddick, and in 2006 Roland Garros QF vs Nadal. He also retired in 2005 Roland Garros R64 vs Guillermo Coria.
Other notable Djokovic retirements:
- 2008 Monte Carlo SF vs Federer
- 2008 Davis Cup singles vs Davydenko