Italy's world number two Jannik Sinner overcame a stiff challenge from American Alex Michelsen to prevail 7-5, 7-6 on Tuesday night and progress to the quarter-finals of the Miami Open.
    In doing so, the 24-year-old also extended his record for the number of consecutive sets won at the Masters 1000 level, 28, after surpassing Novak Djokovic's previous record of 24 in the last round.
    But he had to work hard for it, coming back from a break down when Michelsen was serving for the second set before clinching the match in a tiebreak to set up a clash with another American, 19th-seed Frances Tiafoe.
    "I felt like the serve helped me quite a lot today, especially in important moments and in the tie-break, so I'm happy about that," said Sinner, who seeking to become the first man to complete the 'Sunshine Double' by triumphing at Indian Wells and the Miami Open back-to-back since Roger Federer achieved the feat in 2017.
    "At the same time, I know that if I want to go far in this tournament, I have to improve from the back of the court.
    "Tomorrow is a day off, which helps me and I will try to find good rhythm in the practice session.

Then we'll see how things go.
    "It's completely different conditions to last night (in the victory over France's Corentin Moutet), so I'm happy how I fought.
    "It was very close.

A very close match against Alex. He's a tough opponent, so I'm very happy." Sinner's great rival, world number one Carlos Alcaraz, is out of the Miami Open after losing to Sebastian Korda in the third round.
   

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