A mini fist pump from Murray as he levels 30-30 on Stepanek's serve. 

We proceed into a rally, and the Czech comes out on top as Murray overpowers the baseline. 

We end up at deuce when Stepanek hits a return into the net. 

Advantage Murray, as Stepanek makes the same shot again.

Can he break? Yes he can! Britain's number one is well and truly up for this now. 

He's changed the chant.

"Let's go!!" the Scotsman growls. 

Murray holds his serve to love and all of a sudden the picture changes (slightly). He's 3-0 up in the third and my word is he fired up now. 

"COME ONNNNNNN," roars Andy Murray, as he earns three break points.

Stepanek's first serve is well long, and although he clears his second serve, the Czech's return goes into the net. 

"COME ONNNNNNN." rings out from the mouth of Murray again.

The Stepanek special - a backhand drop shot - is back and it's still making Murray mad. He just can't handle it. 

Murray does hold his serve, despite the Stepanek trick, and he lets out a lion's roar. There's a fire in his belly now (not literally). 

Image source, AP

Theo Bowyer: Murray's in serious trouble here... Being outfoxed by the wily Czech. Needs to Step it up a few levels!

Come on then, tennis fact fans. When was the last time Andy Murray went out in the first round of a Grand Slam?

Answers on Twitter via #bbctennis. 

Simon Briggs
Daily Telegraph tennis correspondent on BBC Radio 5 live sports extra

"Andy Murray is completely unrecognisable from the world number two who beat world number one Novak Djokovic in his last match."

Stepanek takes the second set with a pulsating ace down the middle. 

There's life in the old dog yet, eh?   

Image source, EPA

Matt McGladrigan: Serious danger zone time for Andy. Doesn't want to be two sets down going into tomorrow, with a rest for 37y/o Radek.

Murray, on his second serve, hits a return into the net for 0-15. 

In the absence of hawk-eye, the umpire is forced down to look at a Stepanek return and he rules in Murray's favour to make it 15-15.

But the Czech wins his 16th point from 23 at the net to go back ahead. And a Murray error at the net, after a long rally, hands Stepanek two break points.

Wowzers. He's done it again. Stepanek breaks. He'll serve for the set now. 

Paul Thompson: Surely Andy Murray needs a new full time coach asap? This was not in the script. Fitness is sure to turn into his advantage later.

A brilliant rally draws ooohs and aaahs from the Paris crowd. 

Both men are stuck to their respective baselines. We go back and forth, back and forth, back and....eventually...Stepanek grabs the winner. 

A first double fault from the Czech leaves it at 40-30, but Murray carelessly places a forehand well wide and Stepanek takes a 4-3 lead in the second. 

"Oiiii," blasts Stepanek as he completely mis-hits a backhand. 15-0. 

Andy Murray lands his fifth ace. 30-0.

Forehand winner from Murray. 40-0. 

And seconds later his service game is wrapped up. Easy peasy. 

Image source, Getty Images

Kyle Edmund fails to win the second set against Nikoloz Basilashvili over on court six.

The young Briton, who won the first set on a tie-break, can't repeat the trick as the big-hitting Georgian levels the match.

Still all to play for.

We've hit the hour mark on Phillippe-Chatrier Court and we've got an Andy Murray outburst.

"I killed my legs before the tournament," he appears to shout, randomly. 

They seem to be working OK, though, as he forces deuce on Stepanek's serve.

Stepanek earns his second advantage with a volley close to the net and wraps up the game with a strong serve. 

Now it's Stepanek's turn to start shouting with frustration. He hits long and Murray leads 30-0.

No, wait. Make that 40-0 with an ace. 

No, wait again. He's held his serve. That was speedy work. 

Britain's Naomi Broady has levelled her match against America's Coco Vandeweghe by winning the second set.

She is now starting a final-set decider in a bid to join Heather Watson in the second round.

Should be quite a battle.

Andy Murray's changed his shirt. He's gone from white to black. Maybe to reflect his mood?

Stepanek continues to out-do his opponent in terms of court position. The Czech is making Murray run all over the place.

The 37-year-old is 40-30 up and an ace sees him hold his serve. 

Simon Briggs
Daily Telegraph tennis correspondent on BBC Radio 5 live sports extra

"That has been the worst set Murray has played since Monte Carlo at the start of the clay-court season.

"He's come here on a great run and that'll be very disappointing to lose that set like that. But he's been in these situations against Stepanek before and knows he can get out of it.

"He also knows he has the advantage of superior fitness against a 37-year-old but he'll be hoping the match doesn't go over two days to allow Stepanek the chance to rest."