Right, we are getting dangerously close to another monster shock in the tennis. Serena Williams is not only a set down, she's now a break behind in the second set to Ukraine's Elina Svitolina. Williams, a murderous look in her eye, is stomping around the baseline. This would not be the time to ask her if you can borrow a fiver.

Luke Reddy
BBC Sport in Rio

Image source, .

A 10-goal game offers up some roars and those with tickets for elsewhere peer through fences to learn what's going on. Hockey is suddenly in vogue in Deodoro and from the outside looking in, it does look like a bright and vibrant theatre.

An American behind me is debating if this is tougher than ice hockey. 

Image source, .

That scare of Brazil taking the lead seems a long, long time ago now. Barry Middleton has swept in his second of the game to bring six up for GB.

And here's Mark Gleghorne whipping in a penalty corner to make it a magnificent seven, before Ashley Jackson converts a penalty stroke for eight.

Just to finish off the rout Sam Ward sticks in the ninth.

The Brazilians have shipped 12 goals against Belgium and seven against Spain already in the Games, if that's any barometer.

GB are up to third in Pool A, but Australia will go above them if they beat Belgium later.

Aimee Lewis
BBC Sport in Rio

Once the sun sets, the Olympic Park comes to life, fans coming out of venues, fans going to venues. Americans, Brazilians, Mexicans, young and old, all coming together to watch the world's best athletes, and many have put some thought into their outfits. When the floodlights are turned on, the atmosphere goes up a notch.

Image source, .

Where's my upset klaxon? I'll have it to hand just in case another big name goes out out the tennis draw. Serena Williams is a set down to Ukraine's Elina Svitolina, who won the first stanza 6-4. We're on serve after two games in the second.

Konta wasn't the only British tennis victor today. Andy Murray breezed past Juan Monaco in straight sets to reach the third round.

“I played pretty well," he said. "I hit the ball well from the back of the court. I didn’t make many unforced errors and it was a good match. 

“I’ve played a lot of tennis. It’s been really hard to prepare here after the French and Wimbledon. I haven’t played a match on a hard court for five months so playing two matches every day is not easy on this surface and in these conditions.”

Speaking of tennis, BBC One has just been showing a replay of Johanna Konta's three-set win over Svetlana Kuznetsova. Afterwards this is what she had to say:

"It’s the longest match I’ve had recently. I’ve been very fortunate that I’ve been part of some spectacular matches in my career and hopefully there will be more to come. But that definitely ranks up there just because it’s my first Olympics.

“It was the first chance I had to really showcase such tennis in the biggest sporting event in the world so I feel pretty lucky and privileged that I get another chance tomorrow.

"If you keep it simple, that’s when you’ll see some of the best tennis.”

World number one Serena Williams is in action on centre court against Ukranian Elina Svitolina. There's been a few hiccups from the reigning champion and Svitolina has broken Williams for the second time. The Ukranian currently leads 5-3.

Seriously, what is going on with that Brazil hockey kit? They look like they are off to a rave. Or their cycling proficiency test. One of the all-time worst Olympic kits.

Luke Reddy
BBC Sport in Rio

"Right lads, we've got them right where we want them."

Image source, .

One reverse touch to control, a twizzle of the stick and then a first-time shot - lovely stuff from Sam Ward to put GB 5-1 up with 13 minutes remaining.

To mark your card, there are five more gold medals to be won today. Four of them are in the pool, with the first of those finals getting under way at 02:19 in the morning. The only non-swimming gold is in the men's 69kg weightlifting, which has just got under way.

British athletes Katarina Johnson-Thompson and Michael Rimmer are settling in after arriving from the Team GB holding camp.

KJT competes in the heptathlon alongside Jessica Ennis-Hill on Friday and Saturday while Rimmer goes in the 800m heats on Friday.

The International Olympic Committee has sanctioned four athletes for failing anti-doping tests at Beijing 2008 and London 2012.

They are Turkish weightlifter Nurcan Taylan, Armenian weightlifter Hripsime Khurshudyan, hammer thrower Pavel Kryvitksi of Belarus and Ukrainian Oleksandr P'yatnytsya, who won javelin silver at 2012.

It's all got a bit messy at the Hockey Centre, green cards - for sin bins - dropping like confetti.

In a continuation of the general chaos there's goal-mouth scramble and GB's Harry Martin sneaks the ball home with a backhand from a tight angle.

The replay shows he may have used the back of the stick, but it stands.

News that will interest Johanna Konta. Angelique Kerber has beaten Sam Stosur 6-0 7-5. Konta and Kerber will now meet for a place in the last four. That also clears the court for the arrival of Serena Williams.

Gymnasticspublished at 22:56

22:56

GB finish fifth in team event

Great Britain's Becky Downie: "This is one of the strongest teams we have put out, we could not have done more and nobody should be disappointed."

Amy Tinkler: "It has been an amazing experience and I am proud of everyone.

Ellie Downie: "We put everything we could into this competition. We went out there and enjoyed it, but we did not get the scores on some of the apparatus."

Claudia Fragapane: "I am hpapy to have gone out there and enjoyed the competition. These girls made it fun and we gave it our all."

Ruby Harrold: The whole experience has been fantastic."

Gymnasticspublished at 22:55

22:55

If you missed it earlier on, Great Britain's women finished fifth in the final of the all-around team gymnastics. An irrepressible USA team gold, with Russia claiming silver and China the bronze.

Jut after the final, the British team spoke to BBC TV...