But those two alone could make a big impact when the tennis tournament begins Monday in Flushing, New York.
A Nike video in advance of the event, posted by both sisters Sunday, follows their sibling rivalry and conquest of the tennis world. (See the clip below.)
“You saw two tennis players trying to win a game,” one of them says. “We saw two sisters changing it.”
But would it be all that shocking if both make a splash here?
Like the ad says, “You can’t stop sisters.”