By George Ramsay, CNN

(CNN) — Serena Williams might not be at this year’s US Open, but she is keeping a close eye on proceedings from afar – specifically, her sister Venus’ surprise run in the women’s doubles.

Venus and partner Leylah Fernandez reached the quarterfinals with a 6-3, 6-4 victory over Zhang Shuai and Ekaterina Alexandrova on Monday having not dropped a set in the competition.

They will face top seeds Taylor Townsend and Kateřina Siniaková next, and that match will have keen interest from 23-time grand slam singles champion Serena, who has been watching with her family back home.

“She’s definitely coaching from afar,” Venus told reporters about having support from her sister. “She’s so excited. She gets so nervous watching, and she’s got the kids watching, they’re all at h

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