Many observers noted that Olympia wore her hair in braids with white beads – the same hairstyle her mother famously sported in 1999 when she won her first grand slam tournament in New York.

Serena Williams' sister Venus Williams and her mom are both in the box, along with her coach Rennae Stubbs. Williams' husband, Alexis Ohanian, is also in the stands

Venus and Serena lost their first-round doubles match on Thursday. It is expected to be their last match together as a doubles team in their storied careers.

Serena Williams is working to battle back after a disappointing end to the first set, when she was broken twice.

She opened up with an ace, then hit two unreturnable serves. Later she finished the game off with another massive serve to take the lead in the second set.

Inside the stadium the crowd is loud and exuberant when Williams is playing well, but at other times there is a sense of hushed anxiety.

There was a squeal from Williams as Tomljanović fizzed an ace past her backhand to level the match at 5-5.

American Coco Gauff, who advanced to the round of 16 at the US Open for the first time in her career, is hopeful that she can play Serena Williams in this tournament.

Serena Williams' sister Venus Williams and her mom are both in the box, along with her coach Rennae Stubbs. Williams' husband, Alexis Ohanian, is also in the stands.