The Serena Slam, and the Grand Slam, are still alive.
World No. 1 Serena Williams, who has won the last three Grand Slam tournaments, came one step closer to winning the first three Slams of 2015 when she navigated through a tricky meeting with sister Venus on Monday in the round of 16 at Wimbledon, triumphing 6-4, 6-3.
The only player to beat Serena twice on grass and having won their last meeting, Serena herself pegged Venus as the favorite going into the match. But the younger Williams sister raised her game at the right moments while the elder sister ran out of gas at the end of two tightly-contested sets.
“I knew playing someone like Venus, who’s beaten me the most, I had to be solid,” Serena said. “I had to cut down on my unforced errors. I had to take chances. And I was able to do that. Venus is playing really well. She could probably have played a lot better, as well.”
Serena improved to 15-11 career against Venus, 8-5 in Grand Slam play, and 4-2 at Wimbledon.
Her 25-match winning streak at the Slams will next be tested by No. 25 seed and former world No. 1 Victoria Azarenka, who had little trouble with No. 30 seed Belinda Bencic 6-2, 6-3. Williams leads Azarenka 16-3 in their head-to-head.
No. 4 seed Maria Sharapova dispatched of unseeded Zarina Diyas 6-4, 6-4, and will be involved in the quarterfinal of most interest when she faces explosive unseeded American CoCo Vandeweghe for the first time. Vandeweghe shocked No. 6 seed Lucie Safarova on Monday in two tiebreaks 7-6(1), 7-6(4).
“I didn’t really feel that good,” Vandeweghe summed up after her match. “I thought it was one of the worst matches that I’ve played the whole tournament so far. Serve was kind of in and out. It was there when I needed it, especially towards the end, but I think it was more my court positioning early on. I thought I was too far back, letting her dictate instead of making her feel my presence.”
It was the third straight seeded upset for Vandeweghe after beating No. 11 seed Karolina Pliskova and No. 22 seed Sam Stosur, and has put the former Russian Wimbledon champ Sharapova on alert.
“[Vandeweghe's] game really revolves around that serve, and she’s been using it quite effectively in her previous four matches,” Sharapova said. “It’s always tricky playing against a really good server on grass, because a few points here and there can ultimately tell the difference in the winner and the loser. But I’m looking forward to that match-up.”
It is the first Grand Slam quarterfinal for the world No. 47 Vandeweghe.
Setting up another quarterfinal clash were No. 13 seed Aggie Radwanska and No. 21 Madison Keys. The Pole was too consistent for former No. 1 Jelena Jankovic, beating the No. 28 seed 7-5, 6-4, while Keys overcame a nervous start to beat Belarus qualifier Olga Govortsova 3-6, 6-4, 6-1.
Keys has been put down prior at Wimbledon by Radwanska, and knows the power of the Pole’s scampering and clawing to win matches.
“I think she’s an incredible fighter,” Keys said. “She is a great mover, and her hands are unbelievable. I feel like she’s always there. She makes you play four extra balls. You know, she’s a really tough opponent.”
Also into the quarters were No. 20 Garbine Muguruza, who upset No. 5 Caroline Wozniacki 6-4, 6-4, and No. 15 Timea Bacsinszky who recovered from a disastrous first set to beat the slicing and dicing Romanian Monica Niculescu 1-6, 7-5, 6-2.
“It means a lot because I haven’t played a lot matches on grass, so I didn’t know how to prepare for Wimbledon,” Muguruza said. “I think it’s like the third time I play here. So for me was something new. That’s why it’s special.”
TUESDAY WIMBLEDON SCHEDULE
CENTRE COURT – 1:00PM
Maria Sharapova (RUS)  v Coco Vandeweghe (USA)
Serena Williams (USA)  v Victoria Azarenka (BLR) 
NO.1 COURT – 1:00PM
Novak Djokovic (SRB)  vs Kevin Anderson (RSA) 
Garbine Muguruza (ESP)  v Timea Bacsinszky (SUI) 
Madison Keys (USA)  v Agnieszka Radwanska (POL) 
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