We're down to the final 16 on both the men's and women's sides at Wimbledon. A quick look at the matchups:
(1) Rafael Nadal (Spain) vs (24) Juan Martin Del Potro (Argentina)
Del Potro actually surprisingly has faired fairly well against Nadal in his career going 3-5 against him in 8 matches including a win in straight sets on his way to winning the 2009 U.S. Open. Nadal won their only meeting this year at Indian Wells and also earned a walkover against Del Potro in Madrid. They met just once on grass back in 2007 in London with Nadal winning in straight sets.
(10) Mardy Fish (USA) vs (6) Tomas Berdych (Czech Republic)
The two top tens players have never before met in competition. Fish has never advanced past the 4th Round at Wimbledon before while Berdych made it to the finals of last year's tournament before falling in straight sets to Rafael Nadal 6-3, 7-5, 6-4.
(4) Andy Murray (Great Britain) vs (17) Richard Gasquet (France)
Murray and Gasquet have faced each other 4 times before with each man taking two, but one of Murray's wins was in this round at Wimbledon back in 2008 when the two battled through 5 sets with the Brit coming out on top despite losing the first two sets 5-7, 3-6, 7-6, 6-2, 6-4. Murray has reached the semifinals at the last two Wimbledons while Gasquet made the semifinals back in 2007.
Lukasz Kubot (Poland) vs Feliciano Lopez (Spain)
The two unseeded 29 year olds have met just once in competition with Lopez winning in straight sets in Madrid last year 6-3, 6-3. Lopez has made it to the Wimbledon quarterfinals twice before, in 2005 and 2008, while Kubot has never gotten through the 4th Round of a Grand Slam event.
(7) David Ferrer (Spain) vs (12) Jo-Wilfried Tsonga (France)
Ferrer defeated Tsonga in straight sets last year in Rome in their only meeting 6-4, 6-1. This is the third time that Ferrer has reached the 4th Round at Wimbledon, but he's never advanced beyond this point. Tsonga, meanwhile, is looking to reach the quarterfinals at Wimbledon for the second straight year.
(18) Mikhail Youzhny (Russia) vs (3) Roger Federer (Switzerland)
Federer and Youzhny have faced off against one another ten times in their careers with Federer winning all ten matches, including three on grass. The haven't faced each other since 2007 when they met three times including the 3rd Round of the Australian Open. Youzhny has taken just 2 sets off of Federer out of 24 in their head to head meetings.
Bernard Tomic (Australia) vs Xavier Malisse (Belgium)
Malisse defeated the 18 year old Australian in London last year in 3 sets. Tomic has already knocked off 29th seeded Nikolay Davydenko and 5th seeded Robin Soderling in this tournament, both in straight sets as he looks to build on the deepest Grand Slam run he's ever had. The 30 year old Malisse had has best ever Grand Slam effort at Wimbledon in 2002 when he reached the semifinals.
(19) Michael Llodra (France) vs (2) Novak Djokovic (Serbia)
Djokovic has taken 2 out of 3 from Llodra including a win at Dubai this year, but the two have only played on hard courts before this. The 31 year old Frenchman is looking to get past the 4th Round of a Grand Slam for the first time in 4 tries while Djokovic is looking to continue his strong run in 2011 that already includes an Australian Open title.
(1) Caroline Wozniacki (Denmark) vs (24) Dominika Cibulkova (Slovakia)
Wozniaki and Cibulkova have played each other 8 times before with Wozniacki winning 6 of those matches including a win in straight sets at this year's Australian Open. This will be the first time the two have ever met on grass as their previous 8 meetings all came on hard courts. Despite her number one ranking, Wozniacki has never won a Grand Slam event and has never made it past the 4th round at Wimbledon.
(20) Shuai Peng (China) vs (5) Maria Sharapova (Russia)
Sharapova has taken 2 of 3 from Peng in their careers winning most recently in 3 sets at Indian Wells earlier this year. This will be the first time the two have ever met on grass. Peng is playing in the 4th round of a Grand Slam for just the 2nd time in her career - the first being this year's Australian Open - while Sharapova won Wimbledon back in 2004.
Sabine Lisicki (Germany) vs Petra Cetkovska (Czech Republic)
Lisicki and Cetkovska will be meeting for the first time as both have put together nice runs to the round of 16. Lisicki, also playing in the doubles tournament with Australian Samantha Stosur, knocked off 3rd seed Li Na in the second round 3-6, 6-4, 8-6 while Cetkovska defeated 13th seeded Agnieszka Radwanska 3-6, 7-6, 6-4 and 18th seeded Ana Ivanovic 6-2, 7-6.
(9) Marion Bartoli (France) vs (7) Serena Williams (USA)
Serena and Bartoli have met twice before with Williams taking both matches in straight sets. Serena is a 4 time champion at Wimbledon including wins in both 2009 and 2010 and has 13 Grand Slam Titles to her name. Bartoli's best tournament was the 2007 when she lost in the finals to Serena's sister Venus. This will be the first time the two have ever played each other on grass.
Tamira Paszek (Austria) vs Ksenia Pervak (Russia)
The two 20 year olds will meet for the first time in the 4th Round. Pervak is in the 4th round of a Grand Slam for the first time in her career and has defeated 22nd seeded Shahar Peer and 11th seeded Andrea Petkovic to get here. Paszek also reached the 4th at Wimbledon back in 2007 and defeated 6th seeded Francesca Schiavone in the 3rd round this year 3-6, 6-4, 11-9.
Nadia Petrova (Russia) vs (4) Victoria Azarenka (Belarus)
Petrova and Azarenka have split four career matches including a pair of showdowns at Wimbledon. In 2008 Petrova defeated Azarenka in straight sets 7-6, 7-6, but Azarenka returned the favor in 2009 winning 7-6, 2-6, 6-3. Neither player has ever won a Grand Slam event with Azarenka coming closest losing 3 times in the Finals (twice at the Australian, once at the French).
(8) Petra Kvitova (Czech Republic) vs (19) Yanina Wickmayer (Belarus)
Despite both players being only 21, this will be the 7th time Kvitova and Wickmayer have played, but the first time they'll have faced off on grass. Kvitova has won both matches this year, but both went the full three sets. Kvitova reached the semifinals of Wimbledon last year while the 4th round is the farthest Wickmayer has ever made it.
(23) Venus Williams (USA) vs (32) Tsvetana Pironkova (Bulgaria)
Pironkova has taken 2 of 3 matches from Venus including a straight set win to knock her out of the Wimbledon Quarterfinals last year. Venus has won Wimbledon 5 times previously, most recently in 2008, while Pironkova's run to the semis last year was her best showing in a Grand Slam event.