Nick Kyrgios fights off injury worry to blow Andrey Rublev away in superb Miami Open win

Nick Kyrgios closed out an impressive 6-3 6-0 win over world No 7 Andrey Rublev in just 51 minutes to advance to the Miami Open third-round. The 26-year-old Aussie will return to the world's top 100 after securing the fastest win of the week at the Hard Rock Stadium and he took the chance to pay tribute to his mother after his stunning victory.

Kyrgios has been in good form of late, managing to equal his previous career-best showing in Indian Wells last week by making the quarter-final, where he narrowly lost to Rafael Nadal. The Miami Open is still just his third tournament since taking time off for a knee injury in September, and he started his campaign with a 7-6(3) 6-3 win over Adrian Mannarino.

He had appeared to struggle with a knee injury in the opening round, calling the trainer to court and saying after the match that the pain was an "eight out of ten". And the issue continued to bother him as he faced fifth seed Rublev in a blockbuster second-round clash.

The current world No 102 was broken in the third game of the match but managed to break straight back though could be seen doubled over in pain and holding his knee at the back of the court after levelling things at 2-2. He then won four of the next five games to take the opening set 6-3 in under half an hour.

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His momentum continued into the second set as he broke in the opening game and was forced to save a break point himself to lead 2-0. After the 26-year-old broke the world No 7's serve once again, Rublev received a code violation for smashing his racket into the side board in frustration.

The former world No 13 couldn't be stopped as he held serve and then broke once more to