OK, China are the pair the GB boys are keeping their eye on - the defending champions led through three rounds before an error at the last. Can they claw back the lead?

A huge 3.7 difficulty forward dive with a dizzying 4.5 somersaults! But it's not enough to reclaim the gold medal spot. Great Britain lead heading into the final round!

It's a narrow, narrow lead.

Leon Taylor
Olympic diving silver medallist on BBC TV

It's even better than good. It's awesome.

I'm trying to keep my emotions in check!

We saw the Chinese falter in the last round - our boys have been unphased that all eyes are on them.

You can't discount the Russians - but I have seen that dive done better than that - they're feeling the pressure as well.

Karen Pickering
Swimming & diving expert on BBC Radio 5 live

What a time to bring out a good dive like that!

Nailed it!

How're your nerves? I imagine everyone watching at home is feeling tense, never mind Tom Daley and Matty Lee on the platform.

This is their penultimate dive, a chance to stretch the six-point gap at the top of the leaderboard further. It'll be a 3.4 difficult reverse 3.5 somersault in tuck for the leaders - 89.76 is the verdict, it sends them to 370.80. Looking good with one to go...

There wasn't much to separate Lauren Williams and Hedaya Wahba in the first round but GB's Williams has taken control in the second.

She lands a head shot and a punch in quick succession to lead 12-3.

Leon Taylor
Olympic diving silver medallist on BBC TV

That is an unusual error (from the Chinese).

That is an emptying of the pool - not sure how much of a hammering they'll get from the judges.

Great Britain have set the target of 281.04 after four rounds, but with China still to dive.

The defending champions are last on the platform once more, but was that a slight error? It looked like a big splash on entrance. An anxious wait for the scores...

And GB move into the gold medal spot on 281.04 from China's 274.82! Two rounds to come...

Karen Pickering
Swimming & diving expert on BBC Radio 5 live

There is potential to score highly.

Lovely! Matty didn't quite nail the entry but the synchronisation there was beautiful.

Coach was very happy there - delighted her reaction.

Watching the slow motion together and they are so perfectly in time - wonderful dive!

Leon Taylor
Olympic diving silver medallist on BBC TV

Yes... Yes Yes Yes Yes Yes.

That's all you need to know about that dive.

We're into the business end now. What do Tom Daley and Matty Lee have in their locker? They've held the silver medal spot all the way through the competition so far, it'll need something special to turn that into gold.

A back 3.5 somersault in pike - this one a 3.6 difficulty, but they make it look easy! Hugs in the stands from the GB coaches, that must mean it's good... 93.96! They go top for the moment.

GB's Lauren Williams is on the mat very shortly for her quarter-final.

She takes on Egypt's Hedaya Wahba for a place in the semis.

Kat Downes
Commentator on BBC TV

Still three rounds to go, but the Chinese pair could be dificult to catch now as they go through 200 points

It's been the same pattern so far, Great Britain edging to the top of the leaderboard before the Chinese pair dive and then the reigning champions reclaiming the gold medal spot.

It's another flawless dive for China and after three rounds they are back at the summit on 202.38, with Tom Daley and Matty Lee second at 187.08.

Karen Pickering
Swimming & diving expert on BBC Radio 5 live

Little bit of over- rotation from Matty there on his dive.

They're not quite at the right time, they will be penalised on the synchronisation on that.

Leon Taylor
Olympic diving silver medallist on BBC TV

Absolutely superb. That's exactly what they can do, perfect spin speeds.

Matty Lee just falling away slightly.

Tom Daley and Matty Lee take the board for their third dive. An inward 3.5 somersault with tuck, can they make a move on the leaders? That looks good! What will it score? 79.68 is the result, not quite as much as they were hoping for...

China, the reigning champions, are flying. They leap back into top spot, leaving GB second.

Karen Pickering
Swimming & diving expert on BBC Radio 5 live

It is one of the more complicated ones they could choose.

Again - lovely from both the divers there.

Great synchronisation - not too much splash!

Not quite as smooth and elegant as the Chinese pair we saw earlier but a good result.

Leon Taylor
Olympic diving silver medallist on BBC TV

Yes, even better. They've worked so hard on this dive.

Now we can relax because the required dives are done and now the competition can really start.

OK, dive number two for the Team GB pair, they were second after round one...

A back 1.5 somersault with a half twist, executed very well! 54.60 is the score and it sends them into top spot again on 107.40. So far, so good.