what are all the championships of the season?
brisbane international, australian open, qatar total open, indian wells, sony open tennis, mutua madrid masters, internazionali bnl d'italia, french open, wimbledon, rogers cup, western and southern open, us open, toray pan pacific open, china open, wta tour championships
which are in the grand slam category?
australian open, french open, wimbledon, us open
which of these was the latest championship to take place?
us open