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.
... The racial makeup of the town is 88.27% White, 3.90% African American, 0.20% Native American, 2.13% Asian, 0.05% Pacific Islander, 3.49% from other races, and 1.95% ...