The Swiss world No1 only needs the French Open to complete the full set and his all-round game makes it a case of when rather than if he triumphs in Paris. Pete Sampras, who won a record 14 Slams, never mastered the red clay of Roland Garros and it will always count against him when any debate over the greatest player of all time is held. Federer already has two Wimbledon crowns and the Australian and US Opens to his name.