Svetlana Kuznetsova and Agnieszka Radwanska have played each other the most times of any fourth-round pairing, a 17-match rivalry dating back a decade. Kuznetsova won both the first three (all in 2007) and the most recent three, and leads 3-2 at Slams and 13-4 overall. On grass they are tied at 1-1, though they haven't played on the surface since Radwanska's 6-4, 1-6, 7-5 win in the fourth round of Wimbledon in 2008. Ten of the 17 encounters have gone to three sets - and in three of their last four matches, the victor has had to save at least one match point (Radwanska saved three in Madrid in 2014; Kuznetsova saved one in both Wuhan and the WTA Finals last year).
Venus Williams, at 37 the oldest player left in the draw, takes on the youngest, 19-year-old Ana Konjuh. Williams made her Grand Slam debut at Roland Garros in 1997, seven months before Konjuh was born, and is the oldest player to make the fourth round since a 37-year-old Martina Navratilova in 1994.
Johanna Konta is bidding to become the first British woman to make the quarterfinals in SW19 since Jo Durie in 1984. As the No.10 seed, Durie beat a 15-year-old Steffi Graf - who was making her Wimbledon debut - 3-6, 6-3, 9-7 in the fourth round before losing to Hana Mandlikova 6-1, 6-4.
Jelena Ostapenko is the first woman to have won her first Slam at Roland Garros who has also made the second week at Wimbledon in the same year since Justine Henin's SW19 semifinal run in 2003. In the intervening 14 years, Anastasia Myskina (2004), Ana Ivanovic (2008), Francesca Schiavone (2010), Li Na (2011) and Garbiñe Muguruza (2016) all followed their French Open maiden Slam title with a first-week exit in London.
Johanna Konta leads the ace count among the 16 women left in the draw with 18 (though she still trails the defeated Shelby Rogers, with 24, and Kristina Mladenovic, with 23). Petra Martic has hit the fastest serve of The Championships to date, at 121mph - and, impressively, also has the highest overall first serve percentage of the remaining competitors at 70%.
No.4 seed Elina Svitolina and No.6 seed Johanna Konta are the only players in the fourth round to have won multiple WTA Tour titles in 2017. Svitolina was victorious in Taipei, Dubai, Istanbul and Rome for a Tour-leading four trophies, while Konta triumphed in Sydney and Miami.
The only players to have reached the second week at every Slam in 2017 are Venus Williams (Australian Open runner-up, fourth round at Roland Garros), Garbiñe Muguruza (Australian Open quarterfinalist, fourth round at Roland Garros) and Svetlana Kuznetsova (fourth round in both Melbourne and Paris).
Comeback queens Magdalena Rybarikova and Petra Martic are playing for a berth in what would be a debut Slam quarterfinal for either today. Slovakia's Rybarikova set a career high of No.31 in August 2013 and Croatia's Martic was ranked as high as No.42 in June 2012, but in March of this year injury lay-offs meant that Rybarikova had fallen to No.453 and Martic to No.658. Since then, Rybarikova has put together a 33-6 win-loss record including three ITF titles and a semifinal showing in Nottingham to soar back to No.87, while Martic has compiled a 29-5 record to rise to No.135 (she will break the Top 100 again after Wimbledon).
2015 runner-up Garbiñe Muguruza and 2016 runner-up Angelique Kerber face off today. They have played seven times to date, with Kerber winning the first three encounters and Muguruza the most recent four - including their sole grass meeting, 7-6(12), 1-6, 6-2 in the third round of Wimbledon in 2015.
Petra Martic is bidding to become just the seventh qualifier to make the Wimbledon quarterfinals, and the first since Kaia Kanepi in 2010. She has also struck the most winners in main draw play of any of the remaining women with a total of 101 - closely followed by Ana Konjuh on 100.
Venus Williams is the only senior Wimbledon past champion remaining, having won the singles title five times (2000, 2001, 2005, 2007 and 2008) and the doubles title six times alongside sister Serena (2000, 2002, 2008, 2009, 2012 and 2016). However, there are three former girls' singles champions remaining: Agnieszka Radwanska (2005), Caroline Wozniacki (2006) and Jelena Ostapenko (2014), while Victoria Azarenka is a two-time girls' doubles champion (alongside Olga Govortsova in 2004 and Agnes Szavay in 2005).
If Caroline Wozniacki and Magdalena Rybarikova win their matches today, their quarterfinal would be a rematch of the 2006 girls' final - which Wozniacki won 3-6, 6-1, 6-3.
In Simona Halep's first two matches against Victoria Azarenka, the Romanian garnered a total of just six games. In the third and most recent, in the quarterfinals of the 2015 US Open, she won 6-3, 4-6, 6-4.
Caroline Wozniacki is 0-5 in the Wimbledon round of 16, a SW19 record she shares with Jelena Jankovic among active players. Seeking to change that today, Wozniacki is also the only player who goes into her fourth-round match with an unbeaten record against her opponent: she holds a 2-0 record over CoCo Vandeweghe.
The only countries with multiple representatives in the round of 16 are Croatia (Ana Konjuh and Petra Martic) and the USA (Venus Williams and CoCo Vandeweghe). This marks the first time ever that a Slam second week has featured two Croatian women.
The 2010 Wimbledon runner-up and former World No.2 Vera Zvonareva has made a quiet return to action this week, taking the title in the ITF $15,000 event in Sharm el Sheikh, Egypt with a 1-6, 7-6(4), 7-5 victory in the final over 2016 Australian Open girls' finalist Tereza Mihalikova. Find out more about how she studied for three degrees, including a Masters in Global Studies and Political Science, while on the road with the WTA - and her plans for her comeback - in our exclusive interview.
Magdalena Rybarikova's unique grass-court game taking centre stage has been one of the highlights of the first week of Wimbledon. Steve Tignor has written about the joys of watching the Slovak - and the thrill of a wide-open draw - for Tennis.com.
Look back on highlights of two of the most dramatic third-round matches, Caroline Wozniacki's comeback against Anett Kontaveit and Angelique Kerber's tough three-setter against Shelby Rogers - then vote for your favorite of this year's on-court fashion.