User: What are the Grand Slams of tennis?
Assistant: In tennis there are four major tennis tournaments each year which are each called a Grand Slam tournament.  The first each year is the Australian open, which is played on hard courts.  The second is the French Open, which is played on clay courts.  The third is Wimbledon, which takes place in London on grass courts and the final tournament is the US Open, which takes place in New York City.