There are how many grand slam tournaments ?
Rome , Italy - Foro Italico Beach Volley Grand Slam , 17 - 23 May , 2010 Moscow , Russia – Grand Slam Moscow , June 7 - 14 , 2010 Stavanger , Norway - ConocoPhillips Grand Slam , June 28 - July 4 , 2010 Gstaad , Switzerland – 1 to 1 Energy Grand Slam , 5 - 11 July , 2010 Klagenfurt , Austria – A1 presented by Volksbank , July 26 - August 1 , 2010 Stare Jabłonki , Poland - Mazury Orlen Grand Slam , 2 - 8 August , 2010