2015 London Marathon winner and favourite for the gold Tigist Tufa has pulled up and out.

Leader Justin Rose begins his fourth and final round, still leading by one stroke ahead of playing partner Sweden's Henrik Stenson. 

And both walk off the first green a shot better off.

A birdie to start as Rose moves to 13 under, Stenson progresses to 12 under and the rest drift a little further out of contention.

Russell Fuller
BBC tennis correspondent in Rio

Image source, Rex Features

For Murray to win the Olympics just four or five weeks after winning Wimbledon would be some achievement.

He is so passionate about the Games. It inspires him and Rafa Nadal in a way it perhaps doesn't inspire all of the top players.

Murray and Nadal would crawl over glass for the Olympic gold.

I think Murray will consider this the best achievement of his career if he wins today.  

Great Britain's men's doubles pair of Marcus Ellis and Chris Langridge will take on the world number eight pair of Hiroyuki Endo and Kenichi Hayakawa in the quarter-finals.

BBC One

Image source, AP

Olympic champions Helen Glover and Heather Stanning have been speaking to Hazel Irvine on BBC One just now. 

After their outstanding performance on Friday, they have admitted they are feeling a little tired and emotional. 

"I've cried a lot in the last few days and that is not like me at all! 

"We came here knowing what it means to be Olympic champion so to lose it would have been devastating" said army officer Heather Stanning. 

Helen Glover, on what's next, suggests time off is all they are thinking of. 

"In outstanding moments like this, you are bound to forget the cold, wet mornings, scraping ice off the boat and being sick into a bin after too much training. But I think we will both take time out and be normal people for a while". 

Will they continue to 2020?

Simple answer: "Don't know!" 

Heather, Helen's maid of honour now has big plans for the hen do... 

"Surely Rio is the best venue for a hen do? I think I've planned this quite well actually". 

Mark Cavendish - husband to Peta - goes in the omnium tonight. The opening discipline is the scratch race, which begins at 20:40 BST.

Cavendish is chasing his first Olympic gold.

China's Xu Xin is a bullet-time blur and this is just the warm-up.

Great Britain are up against it in their team quarter-final against China.China have won both previous Olympic team events and the last eight men’s team world titles.

Paul Drinkhall is first on the table trying to stop the tide of points. 

Three-three in the opening game. So far so good.

Image source, AP

There were some scenes in the tennis last night as the tension bubbled up in Juan Martin del Porto's semi-final win over Rafael Nadal.

Less than 24 hours later and the two countries are going up against each other yet again, this time in the men's hockey last eight.

Argentina lead 1-0 in the second period and you can watch over here.

Image source, EPA

South Africa's Jaco Van Zyl hits an eagle on fifth hole. 

The biggest mover of the day so far at the top end of the leaderboard is Ireland's Seamus Power who is four under through five to move to five under overall and a share of seventh.

Image source, Reuters

Competing as a neutral athlete after Kuwait were suspended from the IOC and without a national uniform, Abdullah Al-Rashidi wore an Arsenal jersey for the men's skeet competition.

Asked if he was a supporter of the club, he responded: "I don't know, I just bought it."

Cue "Arsene Wenger could do with someone who could shoot" gags.

Great Britain's Nick Skelton's first Olympics were way back in 1988 in Seoul.

The 58-year-old, aboard Big Star, has just completed qualifying for individual jumping, chalking up four penalties - all for jumping errors.

He is a fan of the British television series 'Only Fools and Horses'. 

For Christmas in 2014, his sons Daniel and Harry presented him with a vintage Robin Reliant three-wheel car like the one that featured in the show.

He has written a book called 'Only Falls and Horses' about his life and riding. 

Watch here.

There are some issues along the Olympic marathon course here in Rio. 

The drinks stations are being criticised for their placement and organisation. 

Meaning many of the athletes are carrying their bottles with them. They have just gone through the 13 km mark in around 44 minutes. 

Watch live here. 

Image source, .

Image source, Getty Images

Great Britain's number one Rajiv Ouseph is in action against Japan's Sho Sasaki later today, knowing that victory would put him into the knockout stages. 

He was scheduled to start shortly after 14:05 BST, but there has been an overrun in the matches before.

Watch over here to keep tabs on the badminton action.

Team GB's Danny Willett has started his final round of Olympic golf in Rio. 

He is currently sitting in 14th with three under par. 

Can he improve? 

Watch live here. 

Abdullah Al-Rashidi received a warm reception from the Rio crowd after while winning bronze in the men's skeet.

The 53-year-old is competing as an Independent Olympic Athlete because his native Kuwait Olympic Committee has been suspended.

Without a national uniform, Al-Rashidi wore an Arsenal jersey for the competition.

What are you up to this Sunday morning? Lie-in? Full English? 

Anyone running 26.2 miles... No?

Just these lot then...

The women's marathon is under way in Rio. 

The winner of the Olympic gold in the men's golf competition gets automatic entry to all four major tournaments in 2017. 

Image source, EPA

Watch live now.