Nadal breezes past Istomin
Rafael Nadal swept aside Denis Istomin to reach the fourth round of the Sony Open while Stanislas Wawrinka, Tomas Berdych, John Isner and Milos Raonic also progressed.
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The world number one, who suffered a shock early exit in his defence of the BNP Paribas Open in Indian Wells two weeks ago, laid down an impressive marker as he bids to win a maiden Miami title.
He broke the helpless Istomin on six occasions and won 54 of 79 points in total, later admitting he was satisfied with his performance against the world number 57.
"I played a very complete match," he said on the ATP Tour's official website. "No mistakes, serving with good percentage, and playing a lot of winners.
"My movements were better than what I did in the last events."
Nadal, who has been runner-up in this tournament on three occasions, will next face Fabio Fognini after the Italian overcome Spaniard Roberto Bautista Agut 4-6 6-3 6-3.
Nadal's conqueror in the Australian Open final in January, Wawrinka, was given few problems as he too advanced to the fourth round following a 7-5 6-4 win over Edouard Roger-Vasselin.
"I'm happy the way I was fighting, the way I was positive in the game," the Swiss said. "Even if I was wasn't moving or playing so as well at the beginning, I stayed with him."
The world number three will next face Alexandr Dolgopolov after the 22nd-seeded Ukrainian came from a set down to defeat Dusan Lajovic 3-6 6-0 7-6 (7/5).
Seeded trio Berdych, Isner and Raonic also progressed through to the last-16 after comfortable wins.
Czech seventh seed Berdych eased past Joao Sousa 6-2 6-4, American Isner, seeded 10th, overcame Nicolas Almagro 7-5 6-3, while 12th seed Raonic thrashed Guillermo Garcia-Lopez 6-1 6-2, with Benjamin Becker also through after seeing off Aljaz Bedene 6-3 7-5.