Following his victory at the Chinese Grand Prix last weekend, Lewis Hamilton described himself as "mentally stronger" than Nico Rosberg, his Mercedes team-mate who finished second.

Rosberg said he felt Hamilton was driving unnecessarily slowly, backing him up into the chasing Ferrari of Sebastian Vettel.

Image source, EPA

Today head of Mercedes motorsport Toto Wolff has had this to say: "We saw tensions between Nico and Lewis in the race and we tackled them directly on Sunday night to stop anything carrying over to this weekend.

"When you have intense competition, it's normal that it causes emotions to run high - and that's not something we want to change.

"China also confirmed that Ferrari will be a threat in all conditions this year, not just when it's very hot. We will have new challenges to face as a team, with another competitor who is much closer to our level of performance."

Fancy brushing up on your German? Jurgen Klopp's press conference, where he is set to announce he will step down as manager from the end of the season, can be followed on Dortmund's website., external from 12:30 BST.

Image source, Reuters

Klopp, 47, is also expected to announce he will be taking a year's break from football.

German tabloid Bild says former Mainz manager Thomas Tuchel will be taking over.

We'll bring you the latest news as we have it.

As we head past midday here's a quick round-up of day so far.

Top story: Jurgen Klopp 'is set to leave Dortmund'

Top feature: Will Stevens: Who is Formula 1's new English driver?

Top video: Michael Vaughan waiting for clarity over new ECB role

Image source, Getty Images

Earlier we heard from Ricky Hatton on how Amir Khan could beat Floyd Mayweather - in fact he said the American would "run a mile" from the Bolton-born fighter (see 11:10).

But now Mayweather says he will fight just once more after next month's clash with Manny Pacquiao, because he no longer enjoys the sport.

The unbeaten American's 2 May fight with Pacquiao is the fifth of a six-fight contract with broadcaster Showtime.

And Mayweather, 38, says the "fun" has gone out of boxing, which he now regards as "a job".

He added: "I don't enjoy it like I once did. My last fight is in September."

Image source, Reuters

More on the news Jurgen Klopp is expected to announce he will step down as manager of Borussia Dortmund at the end of the season in a press conference today.

Writing in the Guardian, German football writer Raphael Honigstein says Klopp's agents have "already received several inquiries for his services"., external

It's being reported that Klopp will take a year's break from football, and that former Mainz manager Thomas Tuchel has been lined up to take over.

Image source, Getty Images

Saracens lock George Kruis has signed a long-term deal to remain at the club.

"We've have a great off the field ethos at Saracens, the club are very interested in player welfare and on the pitch we're in a great position in the league and in Europe," said the 25-year-old England international.

"It was a no brainer for me to extend my deal. You always want to get these things off your mind as soon as possible it's been relatively pain free for me. I'm delighted to commit my future to Saracens."

Image source, Reuters

Borussia Dortmund are holding a press conference at 12:30 BST this afternoon where it's expected Jurgen Klopp will announce he will step down at the end of the season and begin a year's break from football.

Maddy Raman: Football will miss him but Klopp will come back from a year off refreshed and hopefully walk into a top job in England.

Rory: Klopp might have a short break if Manchester City come knocking. He'd clear out the average players and probably bring Marco Reus with him!

Stephen Shaw: I like Klopp, but surely to be great he needs to take the "incredibly disastrous" with the smooth. Too much success too early?

Keep your comments coming using #bbcsportsday, external on Twitter, or post on the BBC Sport Facebook page., external

You can also text in on 81111 in the UK only - but please don't forget to include your name and location.

Image source, Ed Bell/Twitter

Ed Bell: 1993... Blundell Park.. David Kelly scoring the second... pandemonium.

Josh Wilde, Somerset: When Yeovil won at Wembley. The best way to seal promotion with a Paddy Madden wonder goal and enter the Championship fairytale - oh how things have changed...

We're asking for your best promotion memories. Get involved using #bbcsportsday, external on Twitter, or post on the BBC Sport Facebook page., external

You can also text in on 81111 in the UK only - but please don't forget to include your name and location.

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BBC Wales Sport's Gareth Roberts reports that Wales' England-based players will not be allowed to attend their initial pre-World Cup training camps.

Gloucester's Richard Hibbard and Bath-bound Rhys Priestland are unavailable until the day before Wales' first warm-up against Ireland on 8 August - 35 days before the tournament starts.

Aviva Premiership clubs are sticking by their stance, saying: "Our policy is to release players within the rules."

Here's the latest on the news Jurgen Klopp is set to step down as manager of Borussia Dortmund.

Image source, Getty Images

German tabloid Bild say that Klopp has himself asked for his contract, due to run until 2018, to be dissolved at the end of the season and will most likely take a year out.

Klopp, 47, led Dortmund to two Bundesliga titles and a German Cup, also reaching the Champions League final in 2013.

But this season his side have struggled and have only recently steered clear of the relegation zone into 10th.

Sussex have signed former Australia T20 captain George Bailey for the second half of the T20 Blast campaign.

Image source, Getty Images

The 32-year-old top-order batsman will be available the final seven games of the tournament and will also be eligible to play in the One-Day Cup.

Tasmanian-born Bailey has played five Tests, 28 T20Is and 57 one-day international matches for Australia.

"He brings leadership, experience and is a proven one-day player," cricket manager Mark Robinson told BBC Sussex.

Image source, AP

Former two-weight world champion Ricky Hatton believes British compatriot Amir Khan could be the man to dethrone Floyd Mayweather as boxing's pound-for-pound king.

Khan has been seeking a fight with Mayweather for almost two years, but the American WBC and WBA welterweight champion has spurned Khan's advances.

That's no surprise to Hatton, who believes Khan's blurring punches and rapid movement would hand Mayweather his first professional defeat.

"Amir is boxing with a lot more discipline lately, he's in and out and he's not getting involved. I think that type of style will cause Floyd massive problems. I think Floyd would run a mile.

"Amir's as big a name as is out there, he's beaten pretty much everyone, and Mayweather might be forced to fight him."

Image source, Getty Images

Swiss world number nine Stanislas Wawrinka advances to the third round of the Monte Carlo Masters with a straight set victory over Argentina's Juan Monaco, winning 6-1 6-4.

Later today, Rafael Nadal faces qualifier Lucas Pouille and Roger Federer plays Jeremy Chardy.

The World Snooker Championship gets under way on Saturday in Sheffield with live coverage across BBC TV, Red Button, connected TVs, online, tablets and smartphones.

To whet your appetite ahead of the event, former world champion Steve Davis and CBBC's Hacker T Dog give their somewhat different interpretations of the rules of the game.

Image source, AP

A bit more on the news Jurgen Klopp is set to leave his role as manager of Borussia Dortmund, after asking to be released from his contract.

German tabloid Bild is reporting Thomas Tuchel, the former Mainz manager, is the most likely candidate to take over, and that Klopp has asked to leave because of Dortmund's "incredibly disastrous" season.

The Bundesliga club are 10th in the table, 37 points behind leaders Bayern Munich, but spent much of the campaign in the relegation zone.

Image source, AP

Today is the 26th anniversary of the Hillsborough disaster, when 96 Liverpool fans lost their lives at the start of an FA Cup semi-final, following a crush on the steel-fenced terraces of Sheffield Wednesday's stadium in 1989.

To mark the occasion, the Liverpool website has put together a photo compilation, external which "powerfully expresses how and why the 96 fans who lost their lives will never be forgotten".

We'll be bringing you updates from today's memorial service throughout the day, and you can read much more about the Hillsborough disaster and its aftermath here.

Image source, BBC/David McDaid

BBC Sport's David McDaid, external in France: "Qualifying is under way at the European Gymnastics Champs in Montpellier. @amytinkler2 & @elliedownie up first for GB."

You can find out more about the Championships on the BBC Sport website.

This morning we're asking you for your favourite promotion memories...

William Mylchreest: As a 28-year-old Coventry fan I'm a little hazy on promotion. I may be wrong but is it when you actually win a game and go up a place in the league?

Chris Cowan: Kevin Nolan's overhead kick v Sheffield United to bring Newcastle back into the Premier League. Promoted in style.

Kevin Nolan and overhead kick. Wasn't expecting to read those two words together this morning.

Get involved using #bbcsportsday, external on Twitter, or post on the BBC Sport Facebook page., external

You can also text in on 81111 in the UK only - but please don't forget to include your name and location.

There could be some fairly seismic European football news to bring you later today, with German newspaper Bild reporting that Borussia Dortmund manager Jurgen Klopp will step down from his role at the club, external and take a break from football.

Image source, Reuters

Klopp has been linked with a move to the Premier League in the past, but his struggling Borussia side are 10th in the Bundesliga, having spent much of the season in last place.

Dortmund have called a press conference for 12:30 BST this afternoon, and we'll bring you the latest as we have it.

In Division Two, Glamorgan will begin the final day of their game at Leicestershire on 47-3 in their second innings, a lead of 125.

And at Northampton, Gloucestershire will resume on 35-0 after being set 419 to beat Northants.

Remember, you can listen to commentary of all four remaining County Championship games via the BBC Sport website and BBC Sport app on desktop, mobile and tablet.