Re: S.Q.T. (stupid question thread)
Grand Slam was used when Laver won his real Grand Slam I think. It was taken more as a synonym of a great achievement in tennis rather than winning those 4 tournaments. The Australian Open has always been one of the biggest but in terms of prestige I heard it's gone up substantially with the Sampras era.
Johnny Groove probably can answer this the best as well as older posters.