User: Who amongst these are tennis players: Virat Kohli, Roger Federer, Rafael Nadal, Novak Djokovic, Serena Williams, PV Sindhu, Virender Sehwag, Maria Sharapova, Steffi Graf, Venus Williams.
Assistant: Roger Federer, Rafael Nadal, Novak Djokovic, Serena Williams, Maria Sharapova, Steffi Graf, Venus Williams are tennis players.