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Former professional tennis player Jeff Tarango: "Tsonga has all the pressure on him. For Tsonga to be able to stay positive is going to be a challenge for him."

Murray, stubbly and steely, looks really fired up for this one. He completes another straightforward hold with a sizzler of a cross-court forehand.

Tsonga is hanging in there ... for now. He is under pressure on his serve again at 0-30 but fights back to 30-all. From deuce, Murray forces two break points, but can't get enough on his returns, and Tsonga clings on to tie the score.

Superb from Murray. Three big first serves open up a 40-0 lead in the blink of an eye. Tsonga chases down a drop shot but there is so much spin on the ball that he can't control his shot and the game is up.

Tsonga is the slower to settle, and two ugly mis-hits give Murray an early sniff at deuce. Tsonga opts to serve and volley and lands and puts away a crisp backhand, but two more unforced errors from the Frenchman give Murray a break point. Tsonga responds well to the early pressure and levels up when Murray dumps a backhand into the net.

Murray slams down his 19th ace of the tournament to go 30-0 ahead, then completes a service hold to love when Tsonga twice hits backhands long. "What's that you said about my game, Jo-Wilfried?"

BBC Radio 5 live sports extra

Former professional tennis player Jeff Tarango: "I would say Tsonga in four if you really made me go out on a limb."

Back to the present and the warm-ups are complete. Murray takes a last sip of lemon squash, towels down his face and gets ready to serve in the first game of the match...

Image source, AP

One result from today to bring you. Two-time defending champion Serena Williams set up a quarter-final clash with Flavia Pennetta after a straight sets win over Kaia Kanepi.

The 6-3 6-3 victory ensured Williams, 32, remains on course to become only the second woman in the Open Era to win three consecutive US Open titles.

So how do you see this match shaping up? Have you seen enough from Murray to suggest he can beat Tsonga? Or will French flair trump British brawn? Get in touch via #bbctennis, external on Twitter, text us on 81111, or comment on the BBC Sport Facebook page., external

The players are completing their warm-ups on Arthur Ashe stadium court on a sultry Labor Day out in New York. The winner of this match will probably face world number one Novak Djokovic, who has won the first two sets of his fourth-round match against Philipp Kolschreiber of Germany over on Louis Armstrong.

Not surprisingly, Murray sees things differently. Asked how concerned he was by his failure to beat a top-10 player for 13 months, Murray, seeded eighth, said: "Not as much as you guys would think.

"I've beaten many top-10 players over the course of my career in these events, so I'm sure it will happen soon and I hope that's the case on Monday.

"I've had good results against Jo in the past. I lost to him a few weeks ago in Canada but I won against him a few times in a row before that.

"We grew up playing in the juniors and we've played 11 times on the tour, so I know his game pretty well."

Emboldened by that victory, Tsonga has been making a few unflattering comments about Murray, implying the Scot has lost his aura in the locker room.

Tsonga said: "The locker room is maybe a bit less afraid of Andy because he's losing a few more matches than in the past. But I don't know any player who once on court is going to be super confident against Andy.

"He's different than in the past maybe because I feel he's not serving as strong as he used to, nor maybe hitting as strong as he used to.

"And during matches he's showing more when he seems in pain with his back or hip region, I'm not sure. You can see it on some moves, too."

Over the years, Murray has generally had the beating of the athletic Tsonga, winning nine of their first 10 meetings. But the Frenchman ended a six-year losing run with victory in Toronto earlier this month after Murray had let slip a 3-0 lead in the final set.

Piers Newbery
BBC Sport at Flushing Meadows

"The weather forecast warned of a humid, thundery, wet afternoon in New York, but so far we've just had the humidity - and plenty of it. Novak Djokovic has been dripping with sweat from the opening moments against Philipp Kohlschreiber, and Flushing Meadows feels like a giant sauna right now. The conditions will test everyone's fitness, with memories of Murray's opening day cramp not fully erased by his two matches since."

Evening all. Thank you for joining us for Andy Murray's US Open fourth round meeting with Jo-Wilfried Tsonga of France. Murray was the champion at Flushing Meadows in 2012, but since capping an unforgettable 12 months by winning Wimbledon in July 2013, he has not beaten a single player inside the top 10 and has slipped to ninth in the world.

Is Murray about to re-join the path to tennis greatness or continue to veer worryingly towards the ranks of the nearly men?

Image source, Getty Images

Would the real Andy Murray please stand-up?