The lead-up to this summer’s World Championships has been dominated by doping revelations, but starting on Saturday the athletes have a chance to lift their sport from the mire.

Jessica Ennis-Hill and Katarina Johnson-Thompson will clash for the first time since 2012 when they compete in the World Championships in Beijing. Ennis-Hill aims to add at least 250 points to her best.

MARTHA KELNER IN BEIJING: Jessica Ennis-Hill being crowned world champion 13 months since giving birth and after an almighty battle back to fitness seems a mere formality.

Greg Rutherford demanded critics lay off Katarina Johnson-Thompson after her long jump collapse cost her a heptathlon medal at the World Championships in Beijing.

The Muller Anniversary Games takes place at London's Olympic Stadium this weekend as some of the world's best athletes prepare for the start of the 2016 Olympics in Rio de Janeiro next month.

The first full day of Olympic action takes place on August 6. Sportsmail has put together a guide to the seven to follow throughout the Olympic Games and the Paralympic Games in Brazil.

The Scottish runner has been in fine form and she leads a team packed with medal prospects. Performance director Neil Black said he is 'pleased with the blend of the team' for the championships.

She leads Olympic champion Nafissatou Thiam and Carolin Schafer, who sit three and six points back respectively going into the long jump, javelin and 800m.

HOT OR NOT: Patrick Bamford rediscovers form at Middlesbrough

Katarina Johnson-Thompson insists she has no plans to switch away from heptathlon to jumping events - but has indicated she is open to contesting a decathlon before the close of her career.

Sometimes the opposition is just too good. For that reason alone, Katarina Johnson-Thompson will reflect on the silver linings of her trip to Berlin instead of celebrating a golden hat-trick.

Katarina Johnson-Thompson arrived in Austria with doubts in her mind and left on Sunday night having maybe implanted a few in someone else.

EXCLUSIVE INTERVIEW BY RIATH AL-SAMARRAI: Katarina Johnson-Thompson is talking about recognition and the time it can take for some folk to see what is so clear to others.

RIATH AL-SAMARRAI IN DOHA: After all the squirming and falling and doubting and fouling, the Kat finally let herself out of the bag. The 26-year-old can now officially call herself the world's best.

The 26-year-old broke Jessica Ennis-Hill's British record to post 6,981 points and take the title at the World Championships on Thursday. She beat defending champion Nafi Thiam by 304 points.

RIATH AL-SAMARRAI IN DOHA: There were tears before bedtime for Katarina Johnson-Thompson and a few more after breakfast on Friday morning.

Leading athletes from Team GB have taken the extraordinary step of launching legal action against the British Olympic Association over 'ridiculous' marketing rules.

EXCLUSIVE INTERVIEW BY RIATH AL-SAMARRAI: I'll tell you one that surprised me - it was a message from my language tutor,' says Katarina Johnson-Thompson.

There are three significant events in the 2021 athletics calendar, with the European Indoors on March 5-7 joined by the rescheduled World Indoors on March 19-21 and the Tokyo Olympics.

Eagles guitarist Glenn Frey had been hospitalized since November and was in and out of a coma from pneumonia before his death

Adele showed she can nail any musical performance as she channelled her inner Nicki Minaj during a raucous rap performance in Los Angeles on Tuesday.

Nicki Minaj dropped a music video for her new song Megatron, after promoting the track on social media for weeks.

Nicki Minaj showed off her curvaceous figure in a set of sultry Instagram photos. The rapper and singer wore a body contouring brown Fendi dress and also posed with ex-con boyfriend Kenneth Petty.

Twelve years after the release of her first mixtape, Playtime is Over, Nicki Minaj is calling out artists and writers alike for what for not acknowledging her influence on hip hop music.

Nicki Minaj shared a new trailer for Angry Birds 2 that features more of her character than any other. She plays Pinky in the upcoming sequel, a bird who speaks in the English accent she's used before.

Nicki Minaj hit back at naysayers who have been slamming her for dating convicted felon Kenneth 'Zoo' Petty: 'How f***ing dare you talk about lowering standards.'

Barbies everywhere were shook on Thursday, when their queen Nicki Minaj tweeted that she was leaving her music career behind. On Friday, the rapper backtracked and issued an apology.

The rapper posed in a hot pink swimsuit as well as a low-cut silver dress as she was admired by both men and women for the October issue of Elle magazine.

Nicki Minaj brought her hunky fiance, manslaughter convict Kenneth Petty, to a Beverly Hills party for her Fendi collaboration on Tuesday.

Paris Jackson reached back to her inner Hippie style in a retro-suede fringe jacket and flared blue jeans for Nicki Minaj's Fendi Prints On x Nicki Minaj launch party on Tuesday.

The 36-year-old hit back at the 'vicious'chat show host, 55, on Friday's episode of her own Queen Radio show, saying: 'I didn't know that in our society, you have to be plagued by your past.'

Nicki Minaj's brother Jelani Maraj was sentenced to 25 years-to-life in a New York court Monday, following his 2017 conviction for raping an 11-year-old child while her mother was at work.

The 37-year-old singer showcased her curvy figure in a skin-tight top with matching bottoms while heading into Mr. Jones with new hubby, Kenneth 'Zoo' Petty.

Meghan Trainor dropped a music video for the song Nice to Meet Ya featuring Nicki Minaj off her new album, Treat Myself, on Friday.

Listeners called the Anaconda rapper out as disrespectful after using the lyrics: 'All you b*****s Rosa Parks, uh oh, get your a** up' in the forthcoming track, tentatively titled Yikes.

Nastya Nass - a self proclaimed 'twerk icon' with nearly 7million followers - shared video of one of her boisterous classes at the Miami Beach Senior High School gym on February 28.

Nicki Minaj's husband Kenneth Petty has finally registered as a sex offender in California and the charges stemming from his prior failure to do so.

Meek and girlfriend Milan Harris, 30, welcomed a baby boy on Wednesday May 6, which also happened to be the rapper's 33rd birthday. It is their first child together.

The Eagles are low on fire-power with Christian Benteke, Connor Wickham and Alexander Sorloth all having problems - be it form or injury - and Roy Hodgson is desperate to add some attacking threat.

Former Chelsea man Branislav Ivanovic may well have ambitions to become a coach one day, and unintentionally took to the big screen in Zenit St Petersburg's recent match to show off his tactics.

A source claimed that the soap star, 48, told one crew member: 'I know you want some of me,' in a break from filming for the 35th Anniversary special.

Next Monday the BBC are broadcasting a special anniversary episode that will see several of the characters attend a boat party on the Thames.

James, 34, commented on a picture of Jacqueline, 27, writing: 'You look like you are waiting for the sunshine bus and if anyone touches your football you will go mad.'

Speaking on the Distinct Nostalgia podcast , June said: 'It's almost as if I've been bereaved. I don't want a retainer for EastEnders, I've left. I've left for good.'

The actress, 47, is set to return to her iconic role as Bianca Jackson amid the huge upcoming storyline involving her onscreen surrogate daughter Whitney Dean.

Hertfordshire-born Shona McGarty, 28, told Fabulous Magazine her break-up was amicable and that she didn't want to make a public announcement when things fizzled out last year.

Appearing on Thursday's episode of Loose Women, the EastEnders star, 31, reflected on her journey to motherhood after welcoming daughter Dusty in July with husband Matt Kay.

Former EastEnders star Carol Harrison has lashed out at producers of the show and accused them of making her feel 'suicidal' amid a clash over 'sexist and ageist scripts'.

The actress, 57, told her 191,000 Twitter followers she was shocked at the 'nastiness' of comments directed at her after she revealed daughter Maia, 23, had been privately educated.

The EastEnders star, 42, was roasted by his friend for only being interested in women that 'were the same age as his daughter,' and suggested he should try and find a partner through personality.