Georgia Stanway and Jill Scott will get a few minutes here. They replace Lauren Hemp and Kim Little with two minutes plus stoppage time remaining.

Want to find out how an Olympic champion gets pumped up for their big race? Of course you do.

Check out the video below as Adam Peaty reveals his Olympics playlist.

There's a couple of rogue entries in there - but who am I to argue with an Olympic champion?

As it stands, GB have two wins from two and that is enough for them to progress to the knockout stages with a game to spare.

The winner of Group E will play either the third place finisher in Group F or G.

Sue Smith
Former England international on BBC One

A complete mix-up at the back from Japan.

Kim Little does so well, the way she looks after the ball, so tidy, then Lucy Bronze just get's it in.

It's brilliant movement from Ellen White.

So Adam Peaty tops the timesheets and comfortably makes it through to Sunday's final, just ahead of Arno Kamminga of the Netherlands.

There's more good news for Great Britain as James Wilby has also made it through with the sixth-fastest time.

The semi-finals begin at 03:33 BST on Sunday morning.

Adrian Moorhouse
1988 Olympic 100m breaststroke champion on BBC TV

He was very good at the beginning, His flow is phenomenal.

Image source, Reuters

Lucy Bronze whips in the cross and guess who is there to meet it? It's great movement from the onrushing Ellen White, who rises highest and nods it beyond Ayaka Yamashita.

That's three goals in two games for the Manchester City forward at Tokyo 2020!

Image source, Getty Images

Great Britain's Keira Walsh is next to shoot from distance, but it's deflected behind for a corner.

Caroline Weir takes it quickly, but Japan's goalkeeper Ayaka Yamashite collects it before any danger ensues.

There's worrying signs for GB as Lucy Bronze appears to have picked up a knock. Looks like she'll try to run it off.

No world record, but an impressive time of 57.56 - just ahead of his rival Arno Kamminga.

Adam Peaty is steaming through the water and is leading at the halfway stage - are we on for a new WR?

The buzzer goes and and away they go!

Incidentally 56.88 is the world record - set by Peaty in South Korea two years' ago.

He is unbeaten over this distance since 2014 and owns the fastest 15 times in history.

Will he go even faster here?

Adam Peaty begins his quest to become the first GB swimmer to retain an Olympic title shortly. He is in heat seven of the men's 100m breaststroke.

Expect fireworks.

Image source, Getty Images

Adam Peaty's biggest rival, Arno Kamminga of the Netherlands has set a Dutch record in his heat with a time of 57.80.

Definitely one to watch

It's a double change for the hosts now. Jun Endo and Narumi Miura make way for Honoka Hayashi and Mina Tanaka.

Heading into the last 20 minutes. A draw wouldn't be a bad result for either side, but GB will progress to the knockout stages with a win.

Britain's James Wilby, 2019 World Championship silver medallist, finished second in his 100m breaststroke heat with a time of 58.99

The fastest 16 times from across the seven heats progress to the semi-finals.

Mark your cards: Adam Peaty is in heat seven.

It's an instant impact from Caroline Weir. She plays a quick one-two with Lauren Hemp but it's deflected behind from a corner.

After a bit of a scramble in the box, Steph Houghton gets the shot off, but it's over the bar from the GB captain.

Hege Riise's side are settling into this now.

Another good ball into the box from Lauren Hemp almost finds Nikita Parris, but she concedes a foul after a slight touch on the Japanese defender.

Parris screams in frustration, and GB will have to come again.

Sue Smith
Former England international on BBC One

Team GB need to be better on the ball at times but the way that Japan press, work hard and get back into shape so quickly, it makes it difficult for teams when they are trying to attack.

Here comes that GB change. Wales and Chelsea midfielder Sophie Ingle is replaced by Scotland's Caroline Weir.

Still 30 minutes to play, but no sign of a goal just yet.