Venus Williams held up her end of the deal for another all-sisters Australian Open final with a 6-7 , 6-2, 6-3 win over Coco Vandeweghe, becoming the oldest player to reach the final of the tournament in the Open era. The 36-year-old Williams is back in a Grand Slam final for the first time since Wimbledon in 2009 and her first here since 2003, when she lost to her younger sister, Serena.