The Calendar Grand Slam is considered by many to be the pinnacle in tennis achivement. One obvious way to compare those near this achivement is to see how many match victories away from completing The Calendar Grand Slam different player are. Therefore I have complied this list of the number of wins requried to complete The Calendar Grand Slam (note that player's best performances only have been included and I have looked at open-era achivements only): Laver in 1969; 0 wins requried Federer in 2006 and 2007; 1 win required Lendl in 1987; 3 wins required Wilander in 1988; 3 wins required Agassi in 1999; 5 wins required Sampras in 1993; 5 wins required Vilas in 1977; 5* wins required Becker in 1989; 6 wins required Courier in 1992; 7 wins required Borg in 1978 and 1980; 7** wins required Connors in 1974; 7*** wins required McEnroe in 1984; 8**** wins required * Vilas's achivements is based upon the January Australian Open and not the one held in December of the same year ** Borg skipped the Australian Open (which had a 64 player draw at this time) ***Connors was banned from the French Open ****McEnroe skipped the Australian Open This list clearly reflects better on more recent players due to the nature of the Australian Open and the politics surrounding the French Open during some of the earlier years of the open-era. However it is intersting to note that both Lendl and Wilander are several matches clear of Sampras and Agassi. Lendl's consistancy is rarely given the credit it deserves while Wilander just had a one-off great year. It is suprising that Lendl's and Wilander's years were adjacent also (1987 and 1988 ). Vilas's high placing just shows what a strong year he had in 1977 despite failing to take the year end number one ranking. However with two Australian Opens held and Borg conspiculously absent from the French Open his position should be regarded slightly inflated.