By EDDIE PELLS
AP National Writer
LONDON - Andy Murray had all of Britain on edge for five sets.
Andy Murray reacts after defeating Fernando Verdasco of Spain on Wednesday at Wimbledon.
Juan Martin del Potro only took five points to get the fans buzzing at Wimbledon.
Two victories in two very different matches Wednesday sent Murray and del Potro onto the semifinals at the All England Club.
Murray completed his seventh career comeback from two sets down to top Fernando Verdasco, 4-6, 3-6, 6-1, 6-4, 7-5.
"Made some bad mistakes, poor choices on the court," Murray said. "And then, I turned it around really well after that."
Earlier on Centre Court, del Potro hyperextended his left knee and crumpled to the ground on the fifth point, but shook off the injury for a 6-2, 6-4, 7-6 (5) victory over No. 4 David Ferrer.
"To be honest, I didn't want to retire (being) in the quarters for first time at Wimbledon," del Potro said. "And that's the reason for continuing play. The doctors gave me good anti-inflammatories."
Del Potro's next match is Friday against No. 1 Novak Djokovic, who took down No. 7 Tomas Berdych 7-6 (5), 6-4, 6-3 on Court 1.
Murray will play No. 24 Jerzy Janowicz, a 7-5, 6-4, 6-4 winner over Lukasz Kubot in the first Grand Slam meeting between two Polish men.
Going against the 54th-ranked Verdasco, Murray certainly made things interesting for the British fans, looking for one of their own to call a Wimbledon champion for the first time in 77 years. He dropped the first two sets, unable to handle Verdasco's pinpoint serves that reached as high as 136 mph.
Slowly, though, he crept back into the match. In the sixth game of the fourth set, Murray saved a pair of break points - first with a service winner, then with one of his 13 aces. Three games later, he broke Verdasco, then served out the set. In the fifth set, the players held serve for 10 straight games. In the 11th, Murray broke, then served out the match at love.
"I played at a very high level," said Verdasco, appearing in a Grand Slam quarterfinal for the first time since the 2010 U.S. Open. "And to not be able to win is painful, of course."
It was Murray's second comeback from two sets down at Wimbledon, adding to a 2008 victory over Richard Gasquet.
"Yeah, you're obviously concerned," Murray said. "You're more concerned about losing the match, not thinking so much that, I'm going to lose at Wimbledon. You're concerned how the match is going and that you may lose. But when you've been in that position a lot of times, you know how to think through it and not get too far ahead of yourself."
In the earlier match, it looked as if del Potro would be done before he even broke a sweat.
His left knee mummified in athletic tape, the 6-foot-6 Argentine chased an overhead into the corner, but his left foot slipped out from under him. His already aching knee straightened suddenly, then bent backward. Del Potro crumpled to the ground and rolled twice - into the far edge of the court.
"I don't try (for) a spectacular fall, but that was really painful for me," del Potro said.
After a break of about 10 minutes, del Potro was back on the court. He broke Ferrer twice in the first set, then moved easily through the second and third against one of the grittiest players in tennis.
"I have my knee problem, but always the opponent, the other players, can have different injuries, too," del Potro said. "You have to be strong, more than the rest."
Across the way, on Court 1, Janowicz beat Kubot to become the first Polish man to reach a Grand Slam semifinal.
After the match, the players hugged at the net for more than 15 seconds, then exchanged shirts the way soccer players often do at their games. A bit later, Janowicz sat in his chair, clasped his hands over his nose and cried.
"Right now, I'm the most happy person in the world," Janowicz said.
About playing Murray, who won his first Grand Slam tournament last year at the U.S. Open, Janowicz said: "I hope Andy will feel some kind of pressure. I'm sure he'll feel some kind of pressure because Great Britain is waiting for the English champion in Wimbledon."
During a tournament with more than its share of twists and turns - to say nothing of slips and slides - Djokovic and del Potro have gone through virtually unscathed, on the scoreboard at least. Neither man has dropped a set.
Djokovic overcame a two-break, 3-0 deficit in the second set to cruise to his latest victory over Berdych, the 2010 Wimbledon runner-up. Djokovic is in his 13th straight Grand Slam semifinal and in search of his seventh major title.
"Coming into the semifinals, I feel physically fresh," Djokovic said.
No. 8 del Potro wouldn't quite use those terms to describe himself.
He is, however, starting to show the form he used to win his only major championship, the U.S. Open in 2009, which also marks the last time he reached a Grand Slam semifinal. He is 3-8 lifetime against Djokovic, though one of those victories came here, at the All England Club, when he beat the Serb in the Olympic bronze-medal match last year. Del Potro also won their last meeting, earlier this year on hard court at Indian Wells.
"He struggled with injuries in last few years, but every time he comes back, he comes back very strong because he just has this talent," Djokovic said.
Indeed, del Potro - nicknamed "The Tower of Tandil" after his hometown in Argentina - has won despite being wracked with pain since Saturday, when he slipped and hyperextended his left knee for the first time.
He's not the only one to slip at Wimbledon during this fortnight, and he wasn't the only one hurting Wednesday.
Ferrer has also been dealing with ankle and toe issues. He cut short his pre-match hitting session because of pain in his ankle but said that was no excuse. Ferrer, who crossed the net to run toward del Potro to check on him when he fell, said he didn't see much change in his opponent's play after the injury.
"Juan Martin, he was more focused, he was playing more aggressive than me and he served very, very good in all three sets," Ferrer said.
By The Associated Press
At The All England Lawn Tennis & Croquet Club
Purse: $34.9 million (Grand Slam)
Juan Martin del Potro (8), Argentina, def. David Ferrer (4), Spain, 6-2, 6-4, 7-6 (5).
Novak Djokovic (1), Serbia, def. Tomas Berdych (7), Czech Republic, 7-6 (5), 6-4, 6-3.
Jerzy Janowicz (24), Poland, def. Lukasz Kubot, Poland, 7-5, 6-4, 6-4.
Andy Murray (2), Britain, def. Fernando Verdasco, Spain, 4-6, 3-6, 6-1, 6-4, 7-5.
Ivan Dodig, Croatia, and Marcelo Melo (12), Brazil, def. James Blake, United States, and Jurgen Melzer, Austria, 7-5, 6-0, 6-7 (0), 6-4.
Hsieh Su-wei, Taiwan, and Peng Shuai (8), China, def. Jelena Jankovic, Serbia, and Mirjana Lucic-Baroni, Croatia, 6-4, 7-5.
Anna-Lena Groenefeld, Germany, and Kveta Peschke (7), Czech Republic, def. Nadia Petrova, Russia, and Katarina Srebotnik (3), Slovenia, 7-6 (2), 6-3.
Ashleigh Barty and Casey Dellacqua (12), Australia, def. Andrea Hlavackova and Lucie Hradecka (2), Czech Republic, 2-6, 6-2, 6-4.
Shuko Aoyama, Japan, and Chanelle Scheepers, South Africa, def. Julia Goerges, Germany, and Barbora Zahlavova Strycova (16), Czech Republic, 7-6 (6), 5-7, 6-4.
Rohan Bopanna, India, and Zheng Jie (7), China, def. Johan Brunstrom, Sweden, and Katalin Marosi, Hungary, 7-6 (4), 3-6, 6-1.
Horia Tecau, Romania, and Sania Mirza (2), India, def. Eric Butorac, United States, and Alize Cornet, France, 6-1, 7-5.
Bruno Soares, Brazil, and Lisa Raymond (1), United States, def. Frederik Nielsen, Denmark, and Sofia Arvidsson, Sweden, 6-3, 6-4.
Marcin Matkowski, Poland, and Kveta Peschke (11), Czech Republic, def. Alexander Peya, Austria, and Anna-Lena Groenefeld (5), Germany, 6-7 (3), 6-4, 6-2.
Daniel Nestor, Canada, and Kristina Mladenovic (8), France, def. Aisam-ul-Haq Qureshi, Pakistan, and Cara Black (10), Zimbabwe, 3-6, 6-3, 6-2.
Nenad Zimonjic, Serbia, and Katarina Srebotnik (3), Slovenia, def. Scott Lipsky, United States, and Casey Dellacqua (13), Australia, 6-2, 6-7 (3), 6-2.
John Peers and Ashleigh Barty, Australia, def. Marcelo Melo, Brazil, and Liezel Huber (6), United States, 6-4, 1-6, 6-2.
Jean-Julien Rojer, Netherlands, and Vera Dushevina, Russia, def. David Marrero, Spain, and Kimiko Date-Krumm (14), Japan, 6-7 (4), 7-6 (3), 7-5.
Greg Rusedski, Britain, and Fabrice Santoro, France, def. Justin Gimelstob and Todd Martin, United States, 6-1, 4-6, 12-10.
Thomas Enqvist, Sweden, and Mark Philippoussis, Australia, def. Wayne Ferreira, South Africa, and Chris Wilkinson, Britain, 6-4, 6-4.
John and Patrick McEnroe, United States, def. Mansour Bahrami, Iran, and Henri Leconte (2), France, 6-1, 6-4.
Andrew Castle, Britain, and Guy Forget, France, def. Peter Fleming and Johan Kriek, United States, 6-3, 6-4.
Lindsay Davenport, United States, and Martina Hingis, Switzerland, def. Tracy Austin, United States, and Helena Sukova (1), Czech Republic, 6-2, 7-5.
Lucie Ahl, Britain, and Magdalena Maleeva (2), Bulgaria, def. Martina Navratilova and Pam Shriver, United States, 6-2, 7-6 (6).
Rennae Stubbs, Australia, and Andrea Temesvari, Hungary, def. Conchita Martinez, Spain, and Nathalie Tauziat, France, 6-4, 6-3.
Nikola Milojevic (2), Serbia, def. Enzo Couacaud, France, 7-5, 6-4.
Gianluigi Quinzi (6), Italy, def. Johan Sebastien Tatlot (10), France, 6-1, 6-1.
Chung Hyeon, South Korea, def. Nick Kyrgios (1), Australia, 6-2, 6-2.
Kyle Edmund (5), Britain, def. Jonny O'Mara, Britain, 6-3, 6-2.
Laslo Djere (4), Serbia, def. Thanasi Kokkinakis, Australia, 3-6, 6-2, 6-0.
Borna Coric (8), Croatia, def. Filippo Baldi (9), Italy, 6-4, 7-5.
Maximilian Marterer, Germany, def. Christian Garin (7), Chile, 6-3, 3-2, retired.
Stefan Kozlov, United States, def. Alexander Zverev (3), Germany, 1-6, 6-4, 4-0, retired.
Ana Konjuh (2), Croatia, def. Beatriz Haddad Maia, Brazil, 6-2, 6-3.
Louisa Chirico (15), United States, def. Katerina Siniakova (3), Czech Republic, 4-6, 7-5, 6-4.
Barbora Krejcikova (4), Czech Republic, def. Ipek Soylu (16), Turkey, 1-6, 6-3, 6-3.
Belinda Bencic (1), Switzerland, def. Anett Kontaveit (13), Estonia, 6-4, 4-6, 6-2.
Elise Mertens (6), Belgium, def. Carol Zhao (9), Canada, 6-3, 7-5.
Taylor Townsend (5), United States, def. Karin Kennel (11), Switzerland, 6-3, 7-5.
Anhelina Kalinina (12), Ukraine, def. Anastasiya Komardina, Russia, 3-6, 6-4, 6-1.
Jamie Loeb, United States, def. Alice Matteucci, Italy, 6-7 (5), 6-2, 6-3.
Jay Andrijic and Bradley Mousley, Australia, def. Evan Hoyt, Britain, and Wayne Montgomery, South Africa, 6-3, 7-6 (4).
Yoshihito Nishioka, Japan, and Jorge Brian Panta (5), Peru, def. Hong Seong Chan and Kim Young Seok, South Korea, 6-4, 2-6, 6-1.
Hugo Di Feo, Canada, and Mazen Osama, Egypt, def. Pedro Cachin, Argentina, and Guillermo Nunez (4), Chile, 6-7 (1), 7-6 (7), 6-3.
Kyle Edmund, Britain, and Frederico Ferreira Silva (1), Portugal, def. Daniel Windahl and Elias Ymer, Sweden, 7-5, 4-6, 6-3.
Thanasi Kokkinakis and Nick Kyrgios, Australia, def. Rafael Matos and Marcelo Zormann, Brazil, 4-6, 6-3, 6-4.
Benjamin Bonzi and Quentin Halys, France, def. Christian Garin and Nicolas Jarry (3), Chile, walkover.
Maximilian Marterer, Germany, and Lucas Miedler, Austria, def. Samm Butler and Billy Harris, Britain, 6-4, 6-4.
Maxime Janvier, France, and Kamil Majchrzak, Poland, def. Luke Bambridge and Cameron Norrie, Britain, 6-1, 7-5.
Luca Corinteli, United States, and Lucas Gomez, Mexico, def. Chung Hyeon and Lee Duck Hee, South Korea, 6-3, 4-6, 6-2.
Johannes Haerteis and Hannes Wagner, Germany, def. Cem Ilkel, Turkey, and Matej Maruscak, Slovakia, 6-3, 7-6 (1).
Laslo Djere, Serbia, and Martin Redlicki, United States, def. Jamie Malik and Robbie Ridout, Britain, 7-6 (7), 6-2.
Maxime Hamou and Johan Sebastien Tatlot (2), France, def. Karen Khachanov and Daniil Medvedev, Russia, 6-3, 3-6, 6-3.
Enzo Couacaud, France, and Stefano Napolitano, Italy, def. Naoki Nakagawa, Japan, and Gianluigi Quinzi (7), Italy, 6-4, 6-4.
Filippo Baldi and Matteo Donati, Italy, def. Borna Coric, Croatia, and Jonny O'Mara, Britain, 6-7 (4), 6-4, 6-2.
Julian Cash and Joshua Sapwell, Britain, def. Stefan Kozlov and Spencer Papa, United States, 6-7 (4), 6-4, 6-4.
Kamonwan Buayam, Thailand, and Hsu Ching-wen, Taiwan, def. Deborah Chiesa, Italy, and Jana Fett, Croatia, walkover.
Kristina Schmiedlova, Slovakia, and Szabina Szlavikovics, Hungary, def. Marika Akkerman, Canada, and Camila Giangreco Campiz, Paraguay, 6-4, 7-5.
Belinda Bencic, Switzerland, and Petra Uberalova (2), Slovakia, def. Freya Christie and Gabriella Taylor, Britain, 6-1, 7-5.
Sandra Samir, Egypt, and Xu Shilin, China, def. Katherine Ip, Hong Kong, and Dasha Ivanova, United States, 7-5, 4-6, 6-1.
Elise Mertens, Belgium, and Ipek Soylu (3), Turkey, def. Mami Adachi and Hikari Yamamoto, Japan, 7-5, 7-5.
Ioana Ducu, Romania, and Nina Stojanovic (5), Serbia, def. Laura Ucros, Colombia, and Constanza Vega, Argentina, 6-2, 6-4.
Barbora Krejcikova and Katerina Siniakova (1), Czech Republic, def. Katie Boulter and Isabelle Wallace, Britain, 6-0, 6-0.
Viktoriya Lushkova, Ukraine, and Ioana Loredana Rosca, Romania, def. Kyoka Okamura, Japan, and Johnnise Renaud, United States, 7-5, 6-2.
Giulia Pairone, Italy, and Alina Silich, Russia, def. Alice Matteucci, Italy, and Gabriela Pantuckova, Czech Republic, 1-6, 7-5, 6-3.
Carolina Meligeni Rodrigues Alves, Brazil, and Sara Tomic, Australia, def. Anna Brogan and Maia Lumsden, Britain, 6-4, 6-7 (3), 6-0.
Domenica Gonzalez, Ecuador, and Carol Zhao (4), Canada, vs. Harriet Dart and Lana Rush, Britain, 7-6 (2), 6-7 (2), susp., darkness.
Copyright 2013 The Associated Press.