Thea Frodin, down advantage, gets another look at a Elena Rybakina second serve but her backhand return goes into the net.

Rybakina survives the first challenge to her serve.

Elena Rybakina's service game has been going on for more than six minutes. That's probably longer than her previous two or three combined!

This time it's the Kazakh second seed who can't convert advantage, missing a backhand.

Another break point comes and goes for Thea Frodin. Elena Rybakina gifts her advantage with a wild forehand but Frodin can't capitalise on a second serve, returning long.

Third deuce.

Elena Rybakina says not a chance. Booming wide serve which Thea Frodin can only just lay a racquet on.

Make that break point against Elena Rybakina. Who saw that coming?

Now then. Deuce on Elena Rybakina's serve.

Thea Frodin lands a couple of crunching deep return to get into points and pegs the game back from 40-15.

Three double faults in the game from Thea Frodin, including at deuce and advantage.

Elena Rybakina has converted all three of her break points.

Image source, Reuters

Double fault...

Oh, that is quite lovely returning from Elena Rybakina. Camped on the baseline to receive a second serve, she paddles a cross-court backhand winner for 30-15.

Thea Frodin turns the volume up another couple of notches with a pinpoint overhead winner from just inside the baseline but a double fault invites more pressure on her serve.

Rybakina makes a rare assault on the net for a cushioned volley winner. Deuce.

A brief window of opportunity for Thea Frodin as Elena Rybakina follows a double fault with a forehand unforced error.

Rybakina slams it shut with a couple of kick serves, fires a rocket down the T for 40-30, and gratefully accepts a long forehand to complete the hold.

Image source, Getty Images

Flavio Cobolli, speaking on-court after his five-set round one victory: "First of all, I want to say thanks to everybody with me on this incredible comeback that I did today. After two sets down I went to the toilets and I changed everything.

"It's never done, you have to fight until the last point. I have a very incredible team that helped me a lot today, and maybe is the key to looking forward to the next round also."

On wanting the same ball back if he serves an ace: "I don't know. I just want the same ball - it's nothing unfair or special but in my mind to do the same point as also the next one. I keep going like this."

On using the energy from the crowd and giving it back: "You forget an important one - I am also crazy. So, it's really fun to play on this court. I always dreamed to play on this stage and in this kind of match. Every time I have the chance to play on this court I always put my heart and core in. I am like this, I am a warrior and today everybody saw."

Elena Rybakina is dictating points from the baseline but even she can't do anything when Thea Frodin lands consecutive aces for 40-15.

A loose backhand from Rybakina seals the hold.

A rare mistake from Elena Rybakina. She tries to wallop a drive volley out of the sky but closes her racquet face and slams the ball into the net.

But it's an otherwise breezy hold to 15 for the second seed.

Massive return from Elena Rybakina, forcing Thea Frodin into a low squat on the baseline and the American's reply flies long.

She's had two break points in this match and converted both of them.

Oooooh, with the court gaping Thea Frodin pulls a down-the-line backhand centimetres wide.

It's a confident start to the second set by Thea Frodin, attacking the net for a put-away smash after forcing Elena Rybakina wide on her backhand.

Rybakina beats her with a low backhand pass for 15-30 but Frodin responds in style, roaring with delight after unleashing a vicious down-the-line forehand.

The pair trade points for 40-all.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Live

That was key to have that crowd there and that support in a major stadium like this one to help get you through and navigate five sets.

I'm sure there's a level of fatigue but Cobolli did a much better job of masquerading it and offensively after four hours and 12 minutes, gets through to the second round.

Image source, Getty Images

Thea Frodin makes a good return on set point but Elena Rybakina slams back a deep forehand which drags the youngster off court. Her reply dribbles into the net.

Rybakina strolls to her chair. She only dropped three points on serve in the opening set.

Image source, Getty Images

A rare point on Elena Rybakina's serve for Thea Frodin but her 0-15 lead is short-lived.