[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.

[Answer] Cassius Marcellus Clay later became known as:

Step 1 : Introduction to the question "Cassius Marcellus Clay later became known as:"

...The boxer who boasted 'he could float like a butterfly and sting like a bee' converted to Islam and changed his name to Muhammad Ali.

[Ans] In which country do they traditionally bury their wine underground in clay pots?

Step 1 : Introduction to the question "In which country do they traditionally bury their wine underground in clay pots?"

...Georgia, a country at the intersection of Europe and Asia, is a former Soviet republic that’s home to Caucasus Mountain villages and Black Sea beaches. It’s famous for Vardzia, a sprawling cave monastery dating to the 12th century, and the ancient wine-growing region Kakheti. The capital, Tbilisi, is known for the diverse architecture and mazelike, cobblestone streets of its old town.