The famous tennis player known for his rivalry with Roger Federer is Rafael Nadal. Their intense matchups, often characterized by contrasting styles, have captivated tennis fans and defined an era in the sport. Nadal, known for his powerful topspin and incredible footwork, has excelled on clay courts, while Federer excels on grass and hard courts with his graceful play. Their matches, particularly in Grand Slam tournaments, have often been closely contested, adding to their storied rivalry.