i think serena and venus are some of the only tennis players that non"tennis fans" know. so i would have say yes, they are extremely popular.
EDIT: if this was an april fools thing, i am already pretty gullible and dont need no stinking april 1st to remind me. thanks.
"racism is dead, it died when MLK walked on a bridge and freed the slaves. Now we have a socialist Kenyan president who is not an American and if anyone mentions race they are a reverse racist (while racism is dead, reverse racism is alive and well.) #whattheyteachyouatfox"