Roger Federer believes his win over in-form Cameron Norrie shows just how match sharp he is heading into the second week of Wimbledon.

The eight-time champion, feeling his way back into form and fitness following last year's knee operations, beat British 29th seed Norrie 6-4 6-4 5-7 6-4.

Norrie has been one of the stars of the ATP Tour this season, reaching three finals.

And Federer, who is through to the fourth round at Wimbledon for the 18th time, said: "Credit to him for pushing me. I know he’s had a really good season so far. He’s played a ton of matches and a lot of tournaments.

"It’s really a win for me, like a reference point as well. If I can beat somebody of his level who’s played well last week, who is playing at home, who’s played a ton of matches, it’s really… I know who I beat, you know what I mean?

"It’s not just like a guy that can play good on the day. He’s a good player."

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Second seed Daniil Medvedev came from two sets down to beat former finalist Marin Cilic.

The Russian looked like he was heading home as Cilic took a strong lead, but hit back to claim a 6-7 (3-7) 3-6 6-3 6-3 6-2 victory.

It means Medvedev, who is a two-time grand slam finalist, makes the second week at SW19 for the first time.

He will have to improve if he has any credible chance of winning the title next week, though, as he was up against it for long periods on Court One.

Cilic has pedigree at Wimbledon having made the final in 2017 while he won at a warm-up event in Stuttgart a couple of weeks ago.

And he looked back to his best as he put himself in a winning position by taking the first set on a tiebreak and then adding the second with two breaks of serve.

But then Medvedev woke up and, with the help of Cilic's disintegration – where he hit a barrage of unforced errors – began to made his recovery.

Alexander Zverev was made to battle through by a man who had knee surgery just last month.

On 3 June Taylor Fritz left the French Open in a wheelchair after injuring his knee in his second round match. Two days later he had an operation.

His remarkable comeback at SW19 saw the 23-year-old beat fellow Americans Brandon Nakashima and Steve Johnson, and take the first set against fourth seed Zverev, before the German ran out 6-7 (3-7) 6-4 6-3 7-6 (7-4) winner.

"At the end of the day Taylor is a great player," said Zverev. "I think everybody is surprised he’s playing this well, and came back so early after the surgery that he had.

"I’ve got to give credit to him. He played a very good match."

Zverev will play Felix Auger-Aliassime, who progressed after Nick Kyrgios was forced to retire with an abdominal injury with the score one set all.

Kyrgios has been a huge hit with the Wimbledon crowd this year, and he said: "It was heartbreaking for me.

"I told the crowd it was the end of the road. It was a journey. I honestly thought the way I was playing I could have done some pretty cool things this week. But it is what it is."

Queen’s Club winner Matteo Berrettini beat Slovenia’s Aljaz Bedene 6-4 6-4 6-4 to set up a meeting with Ilya Ivashka of Belarus.