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Stephens powers past Muguruza to reach Miami quarters

  • Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States waves to the crowd after her match against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States waves to the crowd after her match against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States smiles at her player's box after her match against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States smiles at her player's box after her match against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States (L) shakes hands with Garbine Muguruza of Spain (R) after their match on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States (L) shakes hands with Garbine Muguruza of Spain (R) after their match on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States hits a backhand against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States hits a backhand against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States hits a forehand against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States hits a forehand against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain hits a backhand against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain hits a backhand against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain hits a backhand against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain hits a backhand against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
  • Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain serves against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
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    Tennis: Miami Open

    Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain serves against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
    Reuters
Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States waves to the crowd after her match against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States smiles at her player's box after her match against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States (L) shakes hands with Garbine Muguruza of Spain (R) after their match on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States hits a backhand against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Sloane Stephens of the United States hits a forehand against Garbine Muguruza of Spain (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain hits a backhand against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain hits a backhand against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Mar 26, 2018; Key Biscayne, FL, USA; Garbine Muguruza of Spain serves against Sloane Stephens of the United States (not pictured) on day seven of the Miami Open at Tennis Center at Crandon Park. Stephens won 6-3, 6-4. Mandatory Credit: Geoff Burke-USA TODAY Sports
Reuters

(Reuters) - U.S. Open champion Sloane Stephens upset Spanish third seed Garbine Muguruza 6-3 6-4 on Monday to reach the Miami Open quarter-finals while Czech Karolina Pliskova advanced when her opponent retired hurt. Stephens, who raised her game to levels similar to last year when she captured a maiden major title in New York, dictated play against the Wimbledon champion from the start. The American 13th seed raced out of the gate by taking eight of the first nine points of the match. After securing a break in the fifth game of the second set, Stephens sent Muguruza packing with a backhand on the line on her second match point. Stephens, who equaled her best result in Miami having also reached the quarter-finals in 2015, will next face German 10th seed Angelique Kerber, a 6-7(1) 7-6(5) 6-3 winner over Chinese qualifier Wang Yafan. Fifth seed Pliskova, who reached last year's Miami semis, was first to reach the quarters after Zarina Diyas of Kazakhstan was forced to retire injured while trailing 6-2 2-1. Former world number one Pliskova was efficient from the start and did not drop a point on her first serves in the entire match against Diyas, who took multiple medical time-outs and was visibly struggling with her movement. Next up for Pliskova will be either former world number one Victoria Azarenka of Belarus or Polish 30th seed Agnieszka Radwanska. In other fourth round action on Monday, three-times champion Venus Williams will face British 11th seed Johanna Konta while French Open champion Jelena Ostapenko will cap the night session with a clash against ninth-seeded Czech Petra Kvitova. (Reporting by Frank Pingue in Toronto, editing by Pritha Sarkar)