Steady on Novak. Remember what happened to Jo-Wilfried Tsonga when he dared to question Murray's form? Djokovic is right to be confident, but so should Murray be after a fine performance in the heat on Arthur Ashe. Wednesday's match will be a repeat of their 2012 final at Flushing Meadows and if it is even half as good, it will be little short of unmissable. How about we reconvene right here to follow the drama? Hope to catch you then. Good night.

Image source, Getty Images

Novak Djokovic says that Murray has "been on and off this year", but that the quarter-final match - a repeat of the 2012 US Open final - will be "very high quality tennis".

He tells Sky Sports, ominously, that he feels "very confident on the court".

The match stats reflect Murray's total dominance over his French opponent. Murray hit 45 winners to Tsonga's 32 and made only 18 unforced errors, compared with 43 by the Frenchman.

And despite Tsonga's pre-match criticisms of Murray's service power, the Scot's average first serve speed of 119mph was only two mph slower than his opponent's. Murray also served 11 aces to Tsonga's six.

Piers Newbery
BBC Sport at Flushing Meadows

"As encouraging as Murray's form was his fitness, which didn't appear to waver during two hours and 35 minutes of oppressive heat and humidity. Meanwhile, over on Armstrong the seemingly unstoppable Eugenie Bouchard was brought to tears at one stage as she suffered badly in the conditions on her way to defeat. It's highly likely the Murray-Djokovic quarter-final will be in the relative cool of Wednesday's night session."

Andrew Neill: , externalBest performance we've seen from Andy since he won at Wimbledon last year. Steely showing and raised his game when needed.

Charles Nurick:, external Great win for Murray. Always seems to produce his best when people are expecting him to struggle, much like vs Raonic in 2012.

Shohidur Rahman:, external Even though Murray beat Tsonga in straight sets he has no chance against Djokovic. Easy win for Novak.

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Eugenie Bouchard's US Open campaign comes to an end as the Canadian seventh seed is beaten in straight sets by Ekatarina Makarova of Russia.

Murray will be delighted to have got a monkey off his back by beating a player ranked in the top 10 for the first time since his Wimbledon triumph in 2013. His reward? A meeting with world number one Novak Djokovic in the quarter-finals on Wednesday.

Andy Murray on Sky Sports: "I though offensively I played well, kept him on the back foot, away from the net. I think was at the net more than him and that was important. He had chances in the second and third sets, but I was happy to come through.

"I always try to take the return early on second serve and I knew that would make Joe go for more huge first serves. He did that and served a couple of doubles - that helped."

Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra

"It was a great performance by Andy. I know he's going to sleep well tonight, but not because he's so tired but because he's got that first top-10 win in a year. It's a whole new ball game and there's no pressure on him whatsoever. He can really shine in this next match."

Andy Murray: "It was extremely tough. I'm just glad I managed to get through. The third set was tougher. His serve is huge and thankfully he missed a few serves in the end."

On his quarter-final clash with Novak Djokovic: "It's a tough match. We've had a lot of long ones, there's normally a lot of rallies. I hope we can play another top-level match but if I play well I have a chance."

Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra

"There's no sprinting to the net after that match, both players were completely exhausted. Tsonga had so many more unforced errors. Tsonga got oppressed by the conditions."

Image source, Getty Images

Murray looks relieved more than anything as he removes his cap to reveal a very sweaty crop of hair. He shakes hands with his opponent then acknowledges the crowds applause. That has to go down as one of the British number one's best performances in quite some time.

Tsonga is in trouble here, as a double fault puts him 0-30 down. Murray slams a backhand past the motionless Tsonga for three match points. Tsonga saves the first with a superb smash, but when a Tsonga backhand drifts long, Murray can celebrate a straight sets win.

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At 40-0, Murray gifts Tsonga a lifeline, corrects his own error with an ace down the middle to move within one game of the match. We've been playing for exactly two and a half hours on a sweltering afternoon in New York.

Laura Lambert: , externalWith Djokovic to face next, who had an easy win, Murray needs to make sure he sees this out in 3, especially in these conditions.

GL: , externalNice work Andy. Keep the points short and get the job done in 3. Early bed this evening would be nice!!

Murray's girlfriend Kim Sears is wearing a top with the word "DREAM" written across it, and her beau is daring to do exactly that as he scents a quarter-final showdown with Novak Djokovic. Tsonga reminds him that's there still work to do though as he holds to 15 for 4-4.

Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra

"I really don't envy either player in this situation because both are definitely hurting. They look like they're in pain, like they're living in Jupiter - the gravity pull is pulling them into their chairs. Did you see them plopping into their chairs?"

Murray's serving blip is well and truly over. He's finding the first serves again, finding the corners again, and seals a hold to love with a drop shot that has more sideways spin than a Shane Warne googly.

What a shot! Murray anticipates a Tsonga smash and, while running at full pelt, leathers it for a winner across the Frenchman. Tsonga is 0-30 down, but shows great spirit to reel off four consecutive points and keep us on serve.

Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra

"I really feel Murray is in a nice commanding position and needs to be more docile about his attitude - but more emphatic with his shots. If you're half a mile ahead in a 10k, don't exaggerate your emotions."