Serena Williams clinched a record 23rd grand slam title at the Australian Open on Saturday but spent most of the immediate aftermath talking about her older sister Venus.

Venus Williams drew on the experience of 73 grand slam campaigns to come from a set down for a 6-7(3) 6-2 6-3 victory over fellow American Coco Vandeweghe on Thursday to set up a possible Australian Open final against her sister Serena.

Venus Williams continued her astonishing late-career revival by felling Anastasia Pavlyuchenkova 6-4 7-6(3) on Tuesday to reach her first Australian Open semi-final in 14 years and become the oldest woman to reach the last four at Melbourne Park in the professional era.

Venus Williams survived a rocky start to reach the second round of her 17th Australian Open on Monday, putting her 7-6 7-5 victory over Kateryna Kozlova down to hard-earned experience.

Venus, Jupiter and Mars to be seen together in the sky this week, in a rare grouping of the three planets.

On Tuesday night, Jupiter and Venus will culminate a month-long dance with what astronomers say will be a dazzling display, appearing just a fraction of a degree apart from one another in the night sky--a show that some astronomers say could account for the "Star of Bethlehem" mentioned in the Bible reports CNN.