Serena Williams, a famous tennis player, saw her sister Venus play with a new friend named Leylah at a big tennis game.
Serena made a funny video showing she was teasing Venus a little bit, but in a playful way.
Even though she joked, Serena was really happy that Venus was winning with her new partner.
Serena and Venus are sisters who always support each other, even when they play different tennis games with different friends.
