PHOTO: Serena Williams has tea with Kim Kardashian West

If you're Serena Williams, what do you do in New York City the night before your US Open quarterfinals match against your sister Venus?

You have tea with Kim Kardashian West, obviously.

Serena and Venus are scheduled to square off at 7 p.m. ET on Tuesday night, under the lights at Arthur Ashe Stadium. Serena - who sees a calendar Grand Slam within reach - has won 15 of 26 career matches against her sister.

At this year's US Open, Serena's lost only one set so far through four rounds, while Venus has dropped two.