I read a book called "Tennis Soup for the Soul" or something a the guy who wrote it trained Venus and Serena. He said tha Venus started out with a western but changed to a more Eastern grip like her sister, Serena.
but i was watching a match i dont remember wen and wen serena missed a volley tracy austin was like serena really didnt get ready for that volley she was still in a western grip and hadnt switched over yet
Actually, she varies between semi-western and western.
People I think confuse western thinking that it's like Amelie Mauresmo- Mauresmo uses a severe western, whereas someone like Serena uses a slight western grip, often times a semi-western. If you watch her trade forehands with someone, you'll see her use semi-western. For higher balls, she hits down on them creating more power by using a western grip; same goes for swinging volleys.
She uses a continental grip for her right hand on her backhand, her serve and her overheads. That's it. (Volleys are hit with a slight eastern grip).