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Miami - World number two Rafael Nadal cruised through to the last 16 at the ATP/WTA Miami Masters tournament, while fourth seeded Andy Murray advanced without even breaking a sweat on Sunday.
Nadal continued his domination over Czech Radek Stepanek with a straight forward 6-2, 6-2 victory in a third round match on centre court.
Murray reached the fourth round by not hitting a ball when Canadian Milos Raonic withdrew with a right ankle injury.
Nadal, who is chasing his first Miami title, has now beaten Stepanek in all six contests dating back to their first meeting in 2004.
"I am just happy to be in the fourth round winning two matches with positive feeling and with comfortable results," Nadal said. "I will just try to keep doing well and try to keep improving a little bit the level."
Nadal finished with three aces, won 74 percent of his first-serve points and saved both break point chances he faced in the 86 minute match.
Nadal advances to face Japan's Kei Nishikori who breezed past Czech Lukas Rosol 6-4, 6-2 on Sunday.
"He's a fantastic player and will be a very difficult match for me," Nadal said of Nishikori. "He has big talent to hit the ball very early, to play very aggressive."
The 24-year-old Scot Murray will tackle French 13th seed Gilles Simon for a place in the quarter-finals of a tournament he won in 2009.
Highly-regarded Canadian 26th seed Raonic had already been forced to pull out of the doubles on Saturday where he and South African partner Kevin Anderson had managed just three games against Michael Llodra and Nenad Zimonjic.
The 21-year-old Raonic had been in a rich vein of form in 2012, winning titles in Chennai and San Jose and making the final in Memphis.
At Indian Wells last week, he was knocked out in the third round by eventual champion Roger Federer.
"The doctor in Spain doesn't think it's anything big. It probably just needs a couple days of rest and, with treatment, it should be OK in a week," said Raonic.
"It's frustrating, but you have to look at the big picture."
Bulgaria's Grigor Dimitrov recorded his first victory over a top 10 player when he beat seventh-seeded Czech Tomas Berdych 6-3, 2-6, 6-4 in two hours and 16 minutes.
Dimitrov saved five of seven break points to reach the fourth round of a Masters 1000 tournament for the first time.
The 20-year-old Dimitrov will next face ninth-seeded Serb Janko Tipsarevic, who fired down 10 aces to get past 18th-seeded Ukrainian Alexandr Dolgopolov 6-4, 5-7, 6-2.
Tipsarevic leads Dimitrov 2-0 in their head-to-head series, with both meetings coming last year at Eastbourne and Washington.
On the women's side, American wild card Venus Williams struggled to defeat Aleksandra Wozniak of Canada 4-6, 6-4, 7-6 (7/5) and top seed Victoria Azarenka powered past Heather Watson 6-0, 6-2 in third round matches on Sunday.
Williams advances to face former world number one Ana Ivanovic who beat 20th seeded Daniela Hantuchova 6-2, 7-6 (7/2).
"I just kept coming back," Williams said. "I tried not to let anything discourage me today. I kept thinking about how I really need this match and I need these points."
Azarenka will square off against 16th seeded Slovakian Dominika Cibulkova for a spot in the quarter-finals.
In other women's matches on Sunday, French seventh seed Marion Bartoli defeated Simona Halep 6-4, 7-6 (8/6) and Poland's Agnieszka Radwanska crushed Silvia Soler-Espinosa, of Spain 6-1, 6-2.
Results on Sunday from the sixth day of the $9.6 million ATP and WTA Miami hardcourt tournament (x denotes seed):
Men
Third round
Grigor Dimitrov (BUL) bt Tomas Berdych (CZE x7) 6-3, 2-6, 6-4
Andy Murray (GBR x4) bt Milos Raonic (CAN x26) - walkover, right ankle injury
Janko Tipsarevic (SRB x9) bt Alexandr Dolgopolov (UKR x18) 6-4, 5-7, 6-2
Gilles Simon (FRA x13) bt Jurgen Melzer (AUT x22) 7-6 (7/5), 6-4
Jo-Wilfried Tsonga (FRA x6) bt Philipp Kohlschreiber (GER x32) 6-4, 7-6 (7/2)
Kei Nishikori (JPN x16) bt Lukas Rosol (CZE) 6-4, 6-2
Rafael Nadal (ESP x2) bt Radek Stepanek (CZE x25) 6-2, 6-2
Florian Mayer (GER x19) bt John Isner (USA x10) 6-4, 6-2
Women
Third round
Dominika Cibulkova (SVK x16) bt Zheng Jie (CHN) 6-2, 6-0
Marion Bartoli (FRA x7) bt Simona Halep (ROM) 6-4, 7-6 (8/6)
Maria Kirilenko (RUS x22) bt Ksenia Pervak (KAZ) 6-2, 6-1
Garbine Muguruza Blanco (ESP) bt Flavia Pennetta (ITA x24) 6-2, 1-6, 7-6 (8/6)
Venus Williams (USA) bt Aleksandra Wozniak (CAN) 4-6, 6-4, 7-6 (7/5)
Ana Ivanovic (SRB x15) bt Daniela Hantuchova (SVK x20) 6-2, 7-6 (7/2)
Agnieszka Radwanska (POL x5) bt Silvia Soler-Espinosa (ESP) 6-1, 6-2
Victoria Azarenka (BLR x1) bt Heather Watson (GBR) 6-0, 6-2
Nadal continued his domination over Czech Radek Stepanek with a straight forward 6-2, 6-2 victory in a third round match on centre court.
Murray reached the fourth round by not hitting a ball when Canadian Milos Raonic withdrew with a right ankle injury.
Nadal, who is chasing his first Miami title, has now beaten Stepanek in all six contests dating back to their first meeting in 2004.
"I am just happy to be in the fourth round winning two matches with positive feeling and with comfortable results," Nadal said. "I will just try to keep doing well and try to keep improving a little bit the level."
Nadal finished with three aces, won 74 percent of his first-serve points and saved both break point chances he faced in the 86 minute match.
Nadal advances to face Japan's Kei Nishikori who breezed past Czech Lukas Rosol 6-4, 6-2 on Sunday.
"He's a fantastic player and will be a very difficult match for me," Nadal said of Nishikori. "He has big talent to hit the ball very early, to play very aggressive."
The 24-year-old Scot Murray will tackle French 13th seed Gilles Simon for a place in the quarter-finals of a tournament he won in 2009.
Highly-regarded Canadian 26th seed Raonic had already been forced to pull out of the doubles on Saturday where he and South African partner Kevin Anderson had managed just three games against Michael Llodra and Nenad Zimonjic.
The 21-year-old Raonic had been in a rich vein of form in 2012, winning titles in Chennai and San Jose and making the final in Memphis.
At Indian Wells last week, he was knocked out in the third round by eventual champion Roger Federer.
"The doctor in Spain doesn't think it's anything big. It probably just needs a couple days of rest and, with treatment, it should be OK in a week," said Raonic.
"It's frustrating, but you have to look at the big picture."
Bulgaria's Grigor Dimitrov recorded his first victory over a top 10 player when he beat seventh-seeded Czech Tomas Berdych 6-3, 2-6, 6-4 in two hours and 16 minutes.
Dimitrov saved five of seven break points to reach the fourth round of a Masters 1000 tournament for the first time.
The 20-year-old Dimitrov will next face ninth-seeded Serb Janko Tipsarevic, who fired down 10 aces to get past 18th-seeded Ukrainian Alexandr Dolgopolov 6-4, 5-7, 6-2.
Tipsarevic leads Dimitrov 2-0 in their head-to-head series, with both meetings coming last year at Eastbourne and Washington.
On the women's side, American wild card Venus Williams struggled to defeat Aleksandra Wozniak of Canada 4-6, 6-4, 7-6 (7/5) and top seed Victoria Azarenka powered past Heather Watson 6-0, 6-2 in third round matches on Sunday.
Williams advances to face former world number one Ana Ivanovic who beat 20th seeded Daniela Hantuchova 6-2, 7-6 (7/2).
"I just kept coming back," Williams said. "I tried not to let anything discourage me today. I kept thinking about how I really need this match and I need these points."
Azarenka will square off against 16th seeded Slovakian Dominika Cibulkova for a spot in the quarter-finals.
In other women's matches on Sunday, French seventh seed Marion Bartoli defeated Simona Halep 6-4, 7-6 (8/6) and Poland's Agnieszka Radwanska crushed Silvia Soler-Espinosa, of Spain 6-1, 6-2.
Results on Sunday from the sixth day of the $9.6 million ATP and WTA Miami hardcourt tournament (x denotes seed):
Men
Third round
Grigor Dimitrov (BUL) bt Tomas Berdych (CZE x7) 6-3, 2-6, 6-4
Andy Murray (GBR x4) bt Milos Raonic (CAN x26) - walkover, right ankle injury
Janko Tipsarevic (SRB x9) bt Alexandr Dolgopolov (UKR x18) 6-4, 5-7, 6-2
Gilles Simon (FRA x13) bt Jurgen Melzer (AUT x22) 7-6 (7/5), 6-4
Jo-Wilfried Tsonga (FRA x6) bt Philipp Kohlschreiber (GER x32) 6-4, 7-6 (7/2)
Kei Nishikori (JPN x16) bt Lukas Rosol (CZE) 6-4, 6-2
Rafael Nadal (ESP x2) bt Radek Stepanek (CZE x25) 6-2, 6-2
Florian Mayer (GER x19) bt John Isner (USA x10) 6-4, 6-2
Women
Third round
Dominika Cibulkova (SVK x16) bt Zheng Jie (CHN) 6-2, 6-0
Marion Bartoli (FRA x7) bt Simona Halep (ROM) 6-4, 7-6 (8/6)
Maria Kirilenko (RUS x22) bt Ksenia Pervak (KAZ) 6-2, 6-1
Garbine Muguruza Blanco (ESP) bt Flavia Pennetta (ITA x24) 6-2, 1-6, 7-6 (8/6)
Venus Williams (USA) bt Aleksandra Wozniak (CAN) 4-6, 6-4, 7-6 (7/5)
Ana Ivanovic (SRB x15) bt Daniela Hantuchova (SVK x20) 6-2, 7-6 (7/2)
Agnieszka Radwanska (POL x5) bt Silvia Soler-Espinosa (ESP) 6-1, 6-2
Victoria Azarenka (BLR x1) bt Heather Watson (GBR) 6-0, 6-2
