Rafael Nadal : `Sport played`: TennisTennis : `~Sport played`: Serena WilliamsSerena Williams starred in Hair Show
[Human]: Have you heard of Rafael Nadal? [Assistant]: Yeah, I know that he's a Spanish tennis player. [Human]: Yeah, really the only tennis player I'm familiar with is Serena Williams. 
Yes, and did you know that Serena Williams actually started playing badminton before switching to tennis?