It feels like it's now or never for Elena Rybakina. Break back point.

Yuliia Starodubtseva is two games away from a HUGE upset.

Elena Rybakina has improved on serve, but Starodubtseva still has the all-important break, so all she needs to do is stay solid in her own service games.

Easier said than done when you're playing a two-time Grand Slam champion.

There's no messing from Novak Djokovic as he wraps up the second set with a service hold to love.

At 40-0 up, the Serb scoops the ball off his toes on the baseline, with the ball somehow finding its way to corner of the court on the opposite side of the net.

Not that Djokovic seems to be in the mood to appreciate his own brilliance today - it's very much a case of getting the job done for the three-time former champion.

Valentin Royer holds to force Novak Djokovic to serve for the set.

The Frenchman has done well, especially given his lack of experience at this level, but he needs to turn the tide quickly if he is to stop Djokovic today.

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Greg Rusedski
Former British number one on BBC Radio 5 Live

That's what you have to do against Djokovic - you have to take on that second serve and you have to go big at times. He's trying to do the right things.

That's more like it. Elena Rybakina breaks to love against Yuliia Starodubtseva and then saves two break points to hold.

The world number 55 still has a break advantage, though.

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A brilliant backhand from Valentin Royer that skips off the line to evade Novak Djokovic as he approaches the net gets a huge ovation from the crowd on Court Philippe-Chatrier.

But the odd point aside, the 24-year-old Frenchman has still been unable to threaten the Serb's serve.

It's another straightforward hold for Djokovic.

Greg Rusedski
Former British number one on BBC Radio 5 Live

The way Djokovic shifts weight and gets the racquet through the ball is exceptional. Your footwork has to be so good to execute the way Novak has today.

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Valentin Royer gets to 40-15 up but is pegged back to deuce after Novak Djokovic unleashes a massive forehand down the line.

Djokovic senses an opportunity and secures the double-break with a angled forehand winner.

Greg Rusedski
Former British number one on BBC Radio 5 Live

Novak is so impressive. He can play himself into Slams that very few players can do.

Sometimes he's a little bit for the taking in the early rounds but once he gets two or three matches under his belt, all of a sudden the level goes back to where it needs to be.

It's all going wrong for Elena Rybakina. This could be the biggest upset of the tournament so far.

The world number two is broken by Yuliia Starodubtseva in the very first game of the decider and then fails to convert a break point to strike back immediately.

Novak Djokovic is back serving into the sun - cue lots of looking up at the sky and mini ball tosses.

There's a pump of the fist as Valentin Royer gets the better of the former world number one in a long rally.

But ultimately it's all to no avail as Djokovic holds with a backhand drive that just catches the outside of the line.

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Greg Rusedski
Former British number one on BBC Radio 5 Live

If you don't hit your spots and mix it up, Djokovic starts to read your toss and anticipates and goes half a step early. Once he starts reading your patterns, you're in big trouble.

Novak Djokovic gets to 30-30 but then overhits a backhand on both of the next two points to allow Valentin Royer to hold.

There's a definite sense that Djokovic wants to get points done and get back into the cool of the locker room.

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Valentin Royer is chuntering away after again failing to make any inroads into Novak Djokovic's serve.

The Frenchman seems annoyed with himself but to be fair, Djokovic has been serving well today. He's made over three-quarters of his first serves and has won more than 80% of the points on them.

Djokovic is still yet to face a break point.

Valentin Royer starts the second set slowly and Novak Djokovic capitalises.

The Frenchman serves a double fault and his next serve is pounced upon by the Serb.

That puts more pressure on Royer, who coughs up another service error to hand the advantage to Djokovic.

Elena Rybakina finally gets on the board in the second set, but it feels a little too late. Even that service hold was a struggle, with Yuliia Starodubtseva forcing deuce after being 40-0 down.

The Ukrainian, in contrast, is a whole lot more ruthless. A speedy love hold and she takes us to a decider.

Valentin Royer flashes back a forehand return winner right out of the Novak Djokovic playbook.

But it's the only point the Frenchman wins in the game as Djokovic clinches the first set with a serve winner.

The 39-year-old will be hoping he can negotiate the rest of the match in as straightforward a fashion as he can. He is already looking a bit puffed and is taking his time to towel down between points.

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Elena Rybakina is out of sorts. It doesn't look like she's struggling with injury or illness, but some of the shots coming off her racquet are wild. All over the place.

It doesn't help that Yuliia Starodubtseva is landing some lovely winners.

The second seed had two break points to claw a break back, but Starodubtseva fights back and now she's only one game away from forcing a decider.

BBC Radio 5 Sports Extra

You can listen to live commentary of Novak Djokovic's second-round match via the "Listen live" link at the top of this page and on BBC Radio 5 Sports Extra.