Later today, Serena Williams will square off against her older sister, Venus Williams, in a US Open quarterfinal match.
It'll be the 27th time that the sisters have played against one another, but this time, there's more at stake than ever before.
Serena is attempting to become the first tennis player since Stefi Graf in 1988 to achieve a "calendar slam" by winning all four Grand Slam tournaments in the same year.
So what do you do when you're on the verge of making sports history and your own sister could wind up standing in your way?
Why, you go out to dinner with Kim Kardashian, of course!
Yes, Serena and Kim hit up Carbone in NYC last night for pre-match meal.
Here's a video of the big-bootied besties making their way through a crowd of paprazzi.
It might seem like an odd way for Serena to get ready for one of the biggest matches of her career, but the girl's gone Hollywood in recent weeks.
Last month, she was spotted making out with Drake after a win in Cincinnati, and now she's grabbing some Italian food and posing for selfies with Kim.
Many have pointed out that it might not be such a bad strategy as Kim has helped athletes (such as Super Bowl champ Reggie Bush) achieve glory in the past.
Whatever happens, we hope Mrs. Kardashian-West will be able to restrain herself from grabbing the mic during Serena's post-match interview.