Good morning and welcome to our LIVE coverage of Karen Khachanov v Alexander Zverev.

I'm exhausted just thinking about that match in retrospect.

KHACHANOV 6-4 6-7 6-2 3-6 3-6 ZVEREV: Khachanov tries a drop shot which has no effect, and Zverev is grateful to take match point and reach his first Grand Slam quarterfinal.

KHACHANOV 6-4 6-7 6-2 3-6 3-5 ZVEREV: The German is closing on victory here after nearly three and a half hours and he looks like he's just walked out on court.

KHACHANOV 6-4 6-7 6-2 3-6 3-4 ZVEREV: Khachanov is proving resilient, hanging on to his serve under Zverev's pressure now.

KHACHANOV 6-4 6-7 6-2 3-6 2-4 ZVEREV: Hold to love for Zverev, and he is looking so happy now. He knows he can win in five - just maybe he's not sure he can win in three or four.

KHACHANOV 6-4 6-7 6-2 3-6 2-3 ZVEREV: Khachanov is going to have to consider targeting the Zverev forehand a bit more - that's where he was having success earlier.

KHACHANOV 6-4 6-7 6-2 3-6 1-3 ZVEREV: Consolidation for Zverev now, and he's looking like he believes in himself, what with the motivational slogans he's yelling, peppered with expletives.

KHACHANOV 6-4 6-7 6-2 3-6 1-2 ZVEREV: It's all down to this shoot-out and Khachanov needs to hit back with vigour, and quickly.

KHACHANOV 6-4 6-7 6-2 3-6 0-2 ZVEREV: Zverev consolidates the break and you wouldn't know he's got a training shoe full of tape.

KHACHANOV 6-4 6-7 6-2 3-6 0-1 ZVEREV: Zverev dances across the court as he wraps up a break from nowhere to open this decider, left foot covered in blisters.

Medical time-out for Zverev, having his second toe on his left foot taped.

KHACHANOV 6-4 6-7 6-2 3-6 ZVEREV: An ace from Zverev to wrap up the game and the set and - yes - secure yet another five-setter for him.

KHACHANOV 6-4 6-7 6-2 3-5 ZVEREV: Khachanov holds serve to close the game but Zverev has that break advantage and will get the chance to serve it out and send us into a fifth.

KHACHANOV 6-4 6-7 6-2 2-5 ZVEREV: After Khachanov essentially broke himself in that previous game, Zverev motors through his service game, roars at himself a bit, and is looking to take this into that decider I predicted around two and a half hours ago.

KHACHANOV 6-4 6-7 6-2 2-4 ZVEREV: And that's an unexpected break for Zverev, fist-pumping as he takes his second opportunity.

KHACHANOV 6-4 6-7 6-2 2-3 ZVEREV: Still with serve.

KHACHANOV 6-4 6-7 6-2 2-2 ZVEREV: Khachanov looks good on his serve, but then he would - he's not faced a break point since the middle of the second set.

KHACHANOV 6-4 6-7 6-2 1-2 ZVEREV: Comfortable hold for Zverev, though, and we're still with serve.