[Answer] Which is the only tennis Grand Slam tournament that is played on grass courts currently?

Step 1 : Introduction to the question "Which is the only tennis Grand Slam tournament that is played on grass courts currently?"

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[Answer] Which Grand Slam tennis tournament is played on red clay courts?

Step 1 : Introduction to the question "Which Grand Slam tennis tournament is played on red clay courts?"

...The French Open is a major tennis tournament held over two weeks between late May and early June at the Stade Roland-Garros in Paris, France. It is the premier clay court tennis championship event in the world. The French Open is currently the only Grand Slam event held on clay, and it is the zenith of the spring clay court season. Clay courts are considered "slow" because the balls bounce relatively high and lose much of their initial speed when contacting the surface. Because of the slow-playing surface, the event is widely considered to be one of the most physically demanding tennis tournaments in the world.