Coco Gauff will face fellow American Claire Liu in the third round.

Qualifier Liu beat Turkey's Zeynep Sonmez in straight sets to reach the third round of a Grand Slam for the first time.

Tracy Austin
Two-time Grand Slam champion on BBC Two

It is incredible for a two-time major champion to have that reaction after a second-round match. It is unbelievable what that means to Coco Gauff.

She's had difficulties on this surface, losing in the first round at Wimbledon last year and having not won a match on grass in a couple of years.

It will be a heartbreaker for Solana Sierra. She won't sleep for a couple of nights, her mum won't either.

Image source, Getty Images

Mirra Andreeva is playing some lovely stuff now as she follows up a slicing drop shot with an ace, before winning the set with a backhand winner down the line.

The Russian fifth seed will be tough to beat if she keeps this up and she's showing why she is the reigning French Open champion.

British duo David Stevenson and Marcus Willis will have company in the second round of the men's doubles.

Former champion Neal Skupski and his American partner Christian Harrison, the fifth seeds have beaten Argentine pair Tomas Etcheverry and Mariano Kestelboim on Court Four, recovering from losing the first-set tie-break to win in three.

Emily Salley
BBC Sport at Wimbledon

A huge sigh of relief for Coco Gauff as she avoids another early Wimbledon exit.

She was made to work for that one, but it’s all worth it in the end and she’s got a beaming smile on her face.

The Court One crowd give Solana Sierra a huge cheer as she walks off. She came so close to knocking out the seventh seed.

That was some finish.

Coco Gauff trailed 7-4 in that tie-break but won six points in a row to avoid a major upset.

Huge credit to Solana Sierra for making a real match of this but the world number 56 from Argentina fell at the final hurdle.

Sam Smith
Former British number one on BBC Two

Coco Gauff survives! Unbelievable - now she can smile.

Goodness me, the drama of the last couple of hours. She was gone in that tie-break, wasn't she?

The mini break is handed back again after Solana Sierra goes all in down the line but cuts it wide.

Stunning stuff from Coco Gauff to go up a mini break.

The American is stretching as she steps back over the baseline but hooks a winner into the corner.

Remarkable!

Sam Smith
Former British number one on BBC Two

Solana Sierra hasn't played too many of these deciding set tie-breaks. She has even forgotten to change ends! It happens to all of us.

I wonder if she can channel what she did at Roland Garros when she beat Jasmine Paolini from a set down? That was the best win of her career. She is starting to get a taste of the big time.

Solana Sierra goes big on a backhand from the middle of the court but she lets out a scream in frustration as it crashes back off the net.

Image source, Getty Images

Can Solana Sierra keep hold of it this time?

She can. Some serious pressure building on Coco Gauff now.

Mirra Andreeva moves up the gears as she earns three break points before Barbora Krejcikova plants a volley wide at the net.

The Russian fifth seed then holds to love with Krejcikova unable to consistently get her returns into play.

The momentum is with Andreeva right now.

Tracy Austin
Two-time Grand Slam champion on BBC Two

It is almost like the win is on Solana Sierra's racquet because she is the one taking all the risks right now.

It seems like Coco Gauff is just getting a lot of balls back in play and defending once again. She doesn't seem too willing to take much risk.

It depends who can execute and if Sierra can keep that consistency.

Solana Sierra gets the mini break back.

There's football going on?

A slip from Coco Gauff allows Solana Sierra to get her first hold.

There are still one or two nerves from Sierra. A simple forehand at the net is overcooked to get his tie-break back on serve.

Emily Salley
BBC Sport at Wimbledon

There might be plenty of empty seats on Centre Court because of the football, but no one is leaving Court One at this point.

Coco Gauff is under pressure on the baseline and she can only guide her forehand wide.

Solana Sierra is back up by a mini break.

A reminder that this is a 10-point tie-break.

Solana Sierra moves a couple of points clear but can't make it three in a row.