Serena Williams has withdrawn from the Hopman Cup because of inflammation in her left knee, a setback in her preparations for next month's Australian Open.

Williams has been replaced by Vicky Duval in the US team for their last Group A match against the Czech Republic on Thursday.

Image source, Getty Images

The US team is 0-2 and cannot reach the final of the international mixed team competition at Perth Arena.

There's tough, and then there's tough.

Let us introduce you to some members of a winter swimming club in the Siberian city of Krasnoyarsk, where temperatures often reach 30 degrees Celsius below zero.

Brace yourselves...

Image source, Reuters

Image source, Reuters

Image source, Reuters

"The moment of immersion is a sensation of delight. Afterwards there's a rush of energy and my entire body feels relaxed," said Mikhail Sashko, 68, chairman of the club. "My wife says I am crazy."

Mikhail, your wife may well be right...  

You're a League Two side on a run of four straight defeats, so how do you go about getting a win?

Face a Premier League side, of course.

Image source, Rex Features

Exeter right-back Christian Ribeiro says their home FA Cup third-round tie against Liverpool is a "bonus".

The club are making their first appearance at this stage of the competition for 11 years.

"This Liverpool game is an amazing distraction and everyone's delighted for it," he told BBC Radio Devon.

Accrington Stanley's Josh Windass and Matt Crooks have agreed outline terms with Rangers with a view to pre-contract deals, BBC Scotland has learned.

The fee for the pair is believed to be £400,000..

Image source, Getty Images

PA Sport is reporting that the midfield duo are travelling to Glasgow and will have medicals with the Championship leaders later this afternoon.

Both men are out of contract at the end of the season and are free to negotiate pre-contracts with Rangers

Read the full piece here

We're expecting Eva Carneiro to leave court any minute now following the start of her constructive dismissal case against Chelsea, and a separate but connected case for alleged discrimination against Jose Mourinho.

She is expected to make a short statement. If she does, we'll let you know what the former Chelsea club doctor - or more likely her lawyer - says.

Maybe we shouldn't have lavished so much praise on her in that previous entry, for Watson has just been crushed in the tie-breaker.

No mercy from her Aussie opponent, who raced into a 6-0 lead and closed it out 7-2.

Big ask now for Watson to come back and win the next two sets.

With Murray beaten earlier, it looks like Britain's involvement in the Hopman Cup is in danger of coming to a premature end. GB beat France in their opening group game, and would have to beat Germany to keep alive their hopes of progressing in the tournament - should they lose to the Auusies.

Image source, Getty Images

It's 6-6, we're into a tie-break, and this has been a terrific first set.

After being broken at the start of the set, Watson has played superbly and came within a whisker of winning it - she had set-point during Gavrilova's marathon final service game.

Watson did remarkably well to stay alive in that set. The Aussie is ranked 36th in the world, 19 places higher than her opponent, but Watson fought like a tiger throughout. She's certainly doing her country proud.

We'll let you know how the tie-break goes...

Image source, Getty Images

Sunderland boss Sam Allardyce's hopes of landing Bayern Munich's Jan Kirchhoff have received a boost after the defender was left out of his club's mid-season trip to Qatar.

The 25-year-old was not among a party of 29 which left for Doha earlier today, with Bayern confirming he had been left behind to push through a move.

A statement on the club's website said: "The travelling party does not include Jan Kirchhoff, who is away with his agent concluding negotiations for a possible transfer."

Having spent nearly all of the Test match in complete control, England are in severe danger of losing this game. 

Ben Stokes and James Taylor have just been dismissed, England are 116-6, a lead of 118, with a session and a half to play. 

Follow it on our live text here - if you can bear it.  

Image source, Getty Images

We'll bring you the answer later today...

At 4-2 down the signs were not looking encouraging for Heather Watson and the GB team.

But the Brit has hit back. It's now 5-4 Watson in the first set and the 23-year-old from Guernsey is looking increasingly assured the longer the contest goes on.

Remember she needs to win if GB are to stay in the Hopman Cup, following Andy Murray's defeat to Nick Kyrgios in this team competition earlier.

Those who play snooker will know how difficult the sport is and will struggle to score 800 points in their whole life.

Image source, PA

Well, five-time world champion Ronnie O'Sullivan compiled his 800th career century break in the Championship League against Barry Hawkins.

'The Rocket' is the first player to achieve the feat and said "getting to a thousand would be good."

Good? That's a bit of an understatement.

Image source, Getty Images

West Bromwich Albion keeper Ben Foster is on course to return to the first team on Saturday after spending nearly nine months on the sidelines with a knee injury.

The 32-year-old has been out of action since damaging his cruciate knee ligaments against Stoke last March.

But after watching Foster play 45 minutes for the club's under-21 side on Tuesday, manager Tony Pulis says the keeper could be involved in Saturday's FA Cup third-round tie against Bristol City.

"I will speak with the medical staff but I would like to think he might be involved in Saturday's FA Cup game," Pulis said.

Katie Gornall
BBC Sport

Image source, Getty Images

Eva Carneiro arrived just after 9 o'clock with her husband Jason for the start of this constructive dismissal case against Chelsea, and a separate but connected case for alleged discrimination against Jose Mourinho. She arrived to a scrum of cameras and photographers, and walked past them without saying anything. 

The hearing itself is held in private in front of a senior judge, beginning at 10:00 GMT this morning. Both sides are outlining the evidence they intend to present - that could include text messages and emails. 

If no settlement is reached between the two sides today, then the date for a full tribunal will be set, probably some time after the end of the season. 

Image source, Getty Images

Andy Murray disappeared straight to the dressing room area - probably to pound the wall in frustration - and Nick Kyrgios has also exited the arena after finishing his on-court TV interview.

Which means it's time for the next Aussie-GB battle, Daria Gavrilova against Heather Watson.

This is a team event - two singles matches and a double - so Watson needs to win, then she and Murray can still advance to the next round with victory in the doubles.

The match has just started and Watson, serving first and wearing a very natty tangerine top, has taken the opening game.

We'll let you know how the contest unfolds.

Owen Bradley
BBC Radio Derby Sport

Derby County have paid Reading £2.5m for the services of Nick Blackman, who joins on a three-and-a-half-year contract, external.

Head coach Paul Clement tells me that - barring injury - that's it for Derby County in this transfer window.

Read the full piece here

Image source, PA

Image source, Getty Images

FA chief Greg Dyke also claimed  England can win the World Cup again "one day soon".

"We owe it to a generation of teenage dreamers to show we can do it again," he added.

"The FA is the richest FA in the world, the most income. The FA has to take some of the blame.

"We should have won a tournament in the last 50 years. We haven't. But we will win in the next 50 years, hopefully long before."

We'll remind him of that in the year 2066...

Image source, Getty Images

Maybe he could have phrased it better but you can't accuse Football Association chairman Greg Dyke of not showing emotion, after he declared "we'll all shoot ourselves" if England fail to progress from their group at Euro 2016.

Roy Hodgson's side have been drawn alongside Wales, Russia and Slovakia for the tournament in France, which starts on 10 June.

"We've got to get out of that group," said Dyke. "If we don't, that really is bad news for English football."

It is the first time in five attempts that Nick Kyrgios has beaten Murray.

"He's a great player in the prime of his career," says Kyrgios, 20.

"I did promise a few of my friends that next time I played Murray I would beat him, and there you go.

"I've put a lot of hard work in over the off-season and it has paid off."

The last time the Australia won the Hopman Cup, by the way, Kyrgios was three-years-old.

Image source, Getty Images

Oh dear. It's game over in Perth where Andy Murray has lost to Nick Kyrgios in straight sets.

The Aussie has taken the tie-break - despite beign pretty grumpy throughout it - to record a 6-4 7-6 victory.

Murray didn't play too badly to be fair, looking in good nick, but Kyrgios' forehand won the day, spanking shots to all corners with unerring precision.

Heather Watson up next in this team event and she needs a win to keep GB's hopes alive.