Serena Williams may not be playing the U.S. Open anymore, but her presence still loomed large on Monday, with Venus Williams revealing her younger sister has been coaching from afar as she and Leylah Fernandez surged into the doubles quarter-finals.

After she and partner Leylah Fernandez won their third-round doubles match at the U.S. Open on Monday, Venus sent a funny message to her sister, who had only days prior shared a funny social media post lamenting Venus's success in another duo.