Serena says that her sister is in better form, and has the “advantage” coming into their 26th meeting. Is she trying to take some of the pressure off of herself? Probably—Serena has enough at the moment with the whole calendar-year Grand Slam thing happening. By every measure, she’s the favorite in this one. Serena is ranked No. 1; Venus is No. 16. Serena hasn’t lost a match at a major since Wimbledon 12 months ago; until this year’s Australian Open, Venus hadn’t reached the quarterfinals of a Slam since 2010. Serena leads their head-to-head 14-11, and has won five of their last six matches. Serena has 20 majors, Venus has seven.

But Serena also has a point when she talks about their relative form at the moment. Venus hasn’t lost a set at Wimbledon so far, and more important, she has been playing better in the tight spots than she normally does these days. Something about this tournament brings out Venus’ self-assurance and resourcefulness like nowhere else; this is where she got her start as a major champion, after all. Serena, on the other hand, had to survive another nervy afternoon, and win by the barest of margins over Heather Watson, just to make it here. Venus also won the last time they met, in Montreal in 2014.

Venus has a real chance here. Her serve and return, the two most important shots on grass, aren’t quite at her sister’s level, but they’re better than just about anyone else’s. And because Venus is less likely than any of her other opponents to give a lead back, Serena probably won’t be able to succumb to another panic attack and still come back to win. Because she knows that, I don’t she’ll have one. Winner: Serena Williams

The thought of this might put a scare into the home folks at Wimbledon. After all, Karlovic is averaging 45 aces per match through his first three rounds. But Murray, and his return, enjoy facing big servers, and especially this big server. He leads their head to head 5-0. Winner: Murray

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Here are two players ranked just inside the Top 25, scrambling up the ladder together. Azarenka, who will be 26 at the end of this month, has been at the top of that ladder, and has been struggling all season to get back there. Bencic, 18, will almost surely be making her first appearance in the Top 10 sooner rather than later. This will be their first meeting, and it’s an intriguing match-up all around.

Azarenka is a slightly bigger hitter, but Bencic is expert at court positioning and taking time away from her opponents. Bencic looks more polished and consistent right now, but Azarenka has proven how high her upside is. There’s a lot at stake for both: Azarenka doesn’t want to lose to a younger player, or go out in the middle rounds of another major; Bencic, who won the title in Eastbourne, doesn’t want her roll to stop here. Winner: Azarenka

Wawrinka is 2-0 against Goffin, and he'll likely be too strong for the undersized Belgian. But Goffin has improved significantly over the last year, and would seem to be due for a signature win. His clean and steady game will be ready if Wawrinka has one of his off days. The only problem is that he hasn't had one of those for a while. Winner: Wawrinka

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Perhaps on another day and at another event, this match wouldn’t be as notable. Radwanska and Jankovic have each been around for a while, and neither is in the Top 10 right now. But the fact that they’re in the bottom half of this particular women’s draw at Wimbledon means that the stakes have skyrocketed. Now that so many seeds and sleepers on that side have been handed their walking papers, including No. 2 Petra Kvitova and No. 3 Simona Halep, anyone is a threat to reach to the final. That certainly includes Radwanska, who made it there in 2012, and Jankovic, who is a former No. 1 and U.S. Open finalist.

Radwanska has a 5-2 edge over Jankovic, while JJ won their last meeting, on clay in Rome in 2014. Aga is the more comfortable and accomplished player on grass; the question is whether Jankovic, with her upset win over Kvitova on Saturday, has finally discovered the surface’s secrets. Winner: Radwanska