terrain de tennis
The French word for Tennis is the same as in English: (le) tennis.
the French use the same word, tennis.
The same word 'tennis'
Tennis is played on tennis courts
Three types of tennis courts are hard courts, clay courts, and grass courts.
hard clay courts
If you're talking about French tennis courts, the most famous one, Rolland Garros, is on a clay court, so the ground is reddish brown.
Tennis courts 'R' Us
The referees use the term 'faute' (fault) or the English term 'out' in French tennis.