US Open
Wimbledon Grand Slam Tournament is played on Grass Court.
This Grand Slam is played in New York state.
Technically the ATP season ends some time after the U.S. Open so it is the last Grand Slam Tournament played, but in the next season the Australian Open is the next Grand Slam tournament played after the US Open.
The French Open is the only grand slam played on a clay court. The tournament is held every spring at Roland Garros in France.
U.s. Open
The Grand Slam is a tennis tournament, while the ATP is an orginization. (Association of Tennis Professionals.)
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Australian open
us open
The All-England Lawn Tennis and Croquet Club in Wimbledon, England, is considered the home of lawn tennis. The club hosts the lone Grand Slam tennis tournament still played on grass.