Grand Slam is a general sports term applied when achieving something special.
Most common uses:
In tennis, winning the Grand Slam is winning the following four tournaments in the same year: Australian Open, French Open, Wimbledon, US Open. Those tournaments are therefore also known as the Grand Slam tournaments.
... In other works, however, Thomas à Kempis
exalts Mary as the queen of heaven, the efficient
mediatress of sinners, and to her all should flee as
to a mother. She should ...