It seems as though most players in tennis seem to have good command of at least 2+ languages. Just a few examples:
- Federer speaks English, German, Swiss-German and French
- Nadal speaks English, Spanish, French and Catalan
- Djokovic speaks too many languages to count
- Thiem speaks English, German and French
- Zverev speaks English, German and Russian
- Medvedev speaks English, Russian and French
- Nishikori speaks English and Japanese (man he's come a long way in learning English compared to when he first came on tour)
- Stan the Man can speak English, French, German, Italian and Czech
- Schwartzman I believe speaks many languages as well likely including English, Spanish, and bit of German, Yiddish and Hebrew
I guess the American and British players are the probably the only mono-lingual people on tour since they don't "need" to learn another language besides English (although Serena has picked up a bit of French, Spanish, and Italian over the years). The Canadian players, however, all seem to speak multiple languages:
- Shapovalov speaks English, Russian, Hebrew, and French
- Bouchard speaks English and French
- Raonic speaks English, Serbian and Montenegrin
- FAA speaks English and French
- Andreescu speaks English and Romanian
- Pospisil speaks English, French and Czech
- Fernandez speaks English, French, and Spanish (understands Tagalog)
*they all would've learned French for at least 5-6 years during grade school as well*