The Duchesses both wore comfortable attire for the day. Meghan opted for a crisp blue-and-white stripped button down shirt from Ralph Lauren, paired with cream wide-leg pants, a straw fedora, and black handbag.
It has also been noted that Kate's decision to wear white or cream at the christening of Prince George, Princess Charlotte, and now Prince Louis is due to the colours perfectly complementing the Royal christening gown, worn by all three children.
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The Duchesses' outing is the first time the ladies have attended an official engagement as a twosome.
New mum Miss Williams could not complete the mother of all victories just ten months after giving birth and was beaten in straight sets by 11th-seeded German Angelique Kerber.
After the match she praised Williams, saying: "Serena you are a great person and a champion, you are coming back and you are such an inspiration for everybody, for all of us and every person watching".
Williams said: "We've always had a wonderful friendship". "She's an incredible person, Angelique is, and she's a really good friend, so I'm really happy for her", she said.
Middleton is expected to attend Sunday's men's singles finale between Serbia's Novak Djokovic and South Africa's Kevin Anderson.