Who did Serena Williams defeat in the 2017 Australian Open final?

Serena Williams defeated Venus Williams in the 2017 Australian Open final. Serena won the all-sisters championship match 6–4, 6–4, claiming her seventh Australian Open singles title.

The victory was historically significant because it gave Serena her 23rd Grand Slam singles title, moving her past Steffi Graf’s Open Era record of 22. She also regained the world No. 1 ranking after the tournament. Serena did not drop a set throughout the event.

The final was the ninth and last meeting between the Williams sisters in a major final. Their previous Australian Open final had come in 2003, when Serena also defeated Venus. A remarkable detail later revealed about the 2017 tournament was that Serena was approximately eight weeks pregnant with her first child, Alexis Olympia Ohanian Jr., when she won.