– It's hard to blame No. 25 seed Serena Williams for having some trouble keeping track of her many titles at the All England Club.

"I don't necessarily have to win another Wimbledon in my career," she said Friday, making a point about not having anything left to prove, "[because] I won — was it six times?"

It's seven. And that count could rise to No. 8 in a little more than a week. Not only is she playing like, well, her most capable self, smacking 13 aces while beating Kristina Mladenovic 7-5, 7-6 (2) for a third consecutive straight-sets victory, but also the other proven contenders keep losing.

Williams is now the only woman left in the draw who has won the trophy at the All England Club, after her older sister, five-time champion Venus, lost to No. 20 Kiki Bertens 6-2, 6-7 (5), 8-6 on Friday, joining defending champion Garbine Muguruza, two-time winner Petra Kvitova and 2004 champ Maria Sharapova as Week 1 departures. And the number of remaining top-10 seeds is down to two after No. 9 Venus and No. 10 Madison Keys — beaten 7-5, 5-7, 6-4 Friday by Evgeniya Rodina, a qualifier ranked 120th — were sent home.

Only No. 1 Simona Halep, who plays her third-round match Saturday, and No. 7 Karolina Pliskova are still around from the top 10.

Next up for Serena Williams on Monday is Rodina in a matchup of two mothers.

"Serena," Rodina said, "is my idol."

Eight-time men's champion Roger Federer ran his Wimbledon winning streak to 29 consecutive sets. No. 8 Kevin Anderson and No. 9 John Isner — the highest-ranked U.S. man — won in straight sets, while No. 11 Sam Querrey of the U.S. lost 5-7, 6-4, 6-4, 6-2 to Gael Monfils of France. Isner next plays No. 31 Stefanos Tsitsipas, the first Greek man into the round of 16 at a Grand Slam tournament in the 50-year professional era.

•The British duo of Cameron Norrie and Jay Clarke lasted only into the second round, but their 6-4, 6-7 (5), 5-7, 6-4, 22-20 loss to Hans Podlipnik-Castillo of Chile and Marcelo Arevalo of Argentina included 87 games over three days, tying for fifth most in men's doubles at Wimbledon, 15 short of the 102 played when Marcelo Melo and Andre Sa topped Kevin Ullyett and Paul Hanley in the second round in 2007.