MELBOURNE, Australia (AP) — Venus Williams has become the oldest woman of the Open era to advance to the Australian Open semifinals.

The 36-year-old Williams won the last six points of a tiebreaker to complete a 6-4, 7-6 win over No. 24 Anastasia Pavlyuchenkova.

The 13th-seeded Williams was behind a service break in the opening set but broke the Russian's serve twice in three games. She hadn't reached the semifinals in Australia since 2003, the year she lost the final to her sister, Serena.

Williams' victory was followed by Coco Vandeweghe's convincing 6-4, 6-0 rout of seventh seed Garbine Muguruza. Vandeweghe dominated the match, giving up just 10 points in the second set after saving the only break point she faced in the first.

The 35th-ranked Vandeweghe is in her first major semifinal after beating Grand Slam winners in back-to-back rounds, including top seed Angelique Kerber in the fourth round.

The men's quarterfinals have opened with fourth seed and reigning U.S. Open champ Stan Wawrinka  coasting at Rod Laver Arena. Wawrinka was a 7-6, 6-4, 6-3 winner over No. 12 Jo-Wilfried Tsonga.

Returning from a six-month injury layoff, 35-year-old Roger Federer lifted his game in a 6-1, 7-5, 6-2 win over Mischa Zverev, the player who eliminated top-seeded Andy Murray from the tournament two nights earlier. That sets up an all-Swiss semifinal.