After two days of almost constant rain Williams' match on the 13,800 temporary stadium court kicked off a busy day as organisers scrambled to get back on schedule after rain washed away three of the first four sessions.
Venus Williams, 38, turned back the clock in the final two sets, dialling up the speed on her first serves and playing stout defence to seal a win that looked unlikely when she was down two breaks in the second set.
The ninth seed Venus Williams of the United States defeated Petra Kvitova of Czech Republic by 6-3, 3-6, 7-6 in the quarterfinal to become the oldest Grand Slam semifinalist since Martina Navratilova at Wimbledon in 1994.
In the last ten editions, Serena Williams has dominated the Tennis' most prestigious competition winning it five times during this time. While Serena has five titles in the past ten years, her sister Venus Williams too has lifted the trophy on couple of occasions.