The Grand Slam Cup was a tennis tournament held annually at the Olympiahalle in Munich, Germany from 1990 through 1999.
Throughout its existence, the Grand Slam Cup was famous for paying out the highest prize money of any tournament in tennis.
Following the discontinuation of the Cup in 1999, the ATP decided to give the event retroactive recognition and added it to players' record of official titles.
The eighth ranked player, however, qualifies only if all Grand Slam singles champions are among the top eight.
Qualification and seeding for the Grand Slam Cup were not related to the ATP computer rankings.