MELBOURNE, Australia >> Venus Williams has returned to the quarterfinals for the ninth time at the Australian Open, where she first made the last eight on debut in 1998.The 36-year-old, seven-time major winner had a 6-3, 7-5 fourth-round win Sunday over No. 181-ranked Mona Barthel, who won three matches in qualifying and then beat two Australian wild cards and Olympic gold medalist Monica Puig in the first three rounds.