There are how many grand slam tournaments ?
Berlin , GermanySmart Grand Slam , June 10–15 , 2008 Paris , FranceHenkel Grand Chelem , June 16–22 , 2008 Stavanger , NorwayConocoPhillips Grand Slam Stavanger , June 24–29 , 2008 Moscow , RussiaMoscow Grand Slam , July 1–6 , 2008 Gstaad , Switzerland1 to 1 Energy Grand Slam 2008 , July 22–27 , 2008 Klagenfurt , AustriaA1 Beach Volleyball Grand Slam presented by NOKIA , July 28 - August 2 , 2008