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Men's singles:
Andy Murray vs Nick Kyrgios
It's a moot point which of these two is under closer scrutiny at the All England Club this fortnight. Is it Murray, who after Novak Djokovic's defeat is now the highest seed left in the competition, and who has a far greater chance of winning his first Grand Slam since the 2013 Wimbledon title? Or perhaps it's Kyrgios, whose every move and utterance - both on the grass and backstage - is analysed and discussed? Those two storylines - Murray's run at the title and Kyrgios' firefight with the tennis establishment - will collide on Centre Court. In all his time on the tour, Murray has never lost to an Australian opponent, with 18 wins from 18 matches. Can he take that run to 19?
Sam Querrey vs Nicolas Mahut
Welcome to the Fourth of July party that Querrey can't have imagined he would ever get the chance to throw. When the draw was made on the Friday morning before The Championships, it certainly appeared as though the man from Thousand Oaks in California would not still be in the tournament on American Independence Day.
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But then Querrey supplied one of the greatest upsets in recent years at the All England Club by beating Djokovic in the third round, for what was the Serb's first defeat at the majors for more than a year. It was the might of Querrey's serve that propelled him to victory and now he meets an opponent who, one summer at Wimbledon, could not break serve for hours. The occasion? The longest match in history, when Mahut lost an 11-hour epic against John Isner, which culminated with a 70-68 final set.
Roger Federer vs Steve Johnson
It's one thing to beat the man formally known as 'Baby Fed', as Johnson did in the third round with his victory over Bulgaria's Grigor Dimitrov, but quite another to skewer Federer himself. That's quite the challenge for the American, who is through to the fourth round at the All England Club for the first time. But Johnson is taking encouragement - and no little inspiration - from his friend Querrey's upset. "That gives everyone confidence," said Johnson, who shares his coach, Craig Boynton, with Querrey. Federer, who is seeking an eighth Wimbledon title, had been projected to meet Djokovic in the semi-finals, so his half of the draw is looking much clearer now. But, a month before he turns 35, Federer is wise enough not to get ahead of himself. If he is to make the most of Djokovic's departure, he must first defeat Johnson and then Croatia's Marin Cilic or Japanese Kei Nishikori.
Ladies' singles
Serena Williams vs Svetlana Kuznetsova
So Williams' pursuit of history moves into the second week, with the Californian now just four matches away from equalling Steffi Graf's modern-era record of 22 Grand Slams. But Williams won't be at at all complacent - her three-setter in the second round against fellow American Christina McHale was a reminder of how she cannot expect to coast her way through the draw to the Champions' Dinner. No one goes from Wimbledon whites to ballgown without some struggles and hardships along the way. Williams, who was very much in command against Germany's Annika Beck, has a potentially awkward meeting here with Kuznetsova. The Russian has already won two Grand Slams - the US Open and the French Open - and would much like to add a third on the grass. Her determination was clear on Sunday when, having trailed 2-5 in the third set against American Sloane Stephens, she took that decider 8-6.
Venus Williams vs Carla Suarez Navarro
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Six years have passed since Williams, a winner of five Wimbledon singles titles, last featured in the quarter-finals. That's far too long ago for a player of her grass court history and ability. The older of the Williams sisters, who turned 36 the other day, had an almighty struggle in her last match, finally winning the third set against Russia's Daria Kasatkina by the remarkable scoreline of 10-8. But perhaps she might find life a little easier when she faces a opponent from the Canary Islands who has never previously gone beyond the fourth round on these lawns.
Simona Halep vs Madison Keys
After the shock of last summer, when she lost in the first round to an opponent ranked outside the top 100, Halep is re-establishing her grass court authority. She can clearly play on this surface - she was a semi-finalist two years ago, and she has made the last 16 this year without dropping a set. But now the Romanian plays a young American with the talent and the ambition to do great things here. Last year, Keys reached the quarter-finals for the first time and victory would take her into the last eight once again. Few would be surprised if Keys ends up winning this title at some stage in her career. It might even happen for her this week.
