Mo Farah has performed a U-turn and elected to defend his 10,000m title at the Tokyo Olympics next year.

Two years ago, Farah walked away from track events to concentrate on marathons and he finished eighth across 26.2 miles in Chicago last month having won the event in 2018.

However, the 36-year-old has decided to return to shorter distances and will aim to add to his Olympic medal collection at the next Games.

Farah, who will still need to qualify for the event in Tokyo, won gold over 5,000m and 10,000m at the 2012 and 2016 Olympics.

"It's been really exciting to compete at the marathon for the last couple of years," Farah said in a message posted on his YouTube Channel.

"To win the Chicago Marathon, as a major marathon, that was nice. To finish third in the London Marathon, was okay, it was good.

"It's been a good learning curve for me - doing the marathon, to run 2:05 - British record, European record. The training for it was totally different to the track.

"Next year I've decided, Tokyo 2020, I'm going to be back on the track. I'm really excited to be competing back on the track and giving it a go in the 10,000 metres.

"Hopefully I haven't lost my speed. I'll train hard for it and see what I can do."

Alberto Salazar has formally lodged an appeal against his four-year ban from athletics to the Court of Arbitration for Sport (CAS), the ruling body has confirmed.

Salazar, along with Dr Jeffrey Brown, received a hefty suspension after being found guilty of possessing and trafficking banned substances by the United States Anti-Doping Agency (USADA)

Following news of Salazar's ban, Nike closed down the 61-year-old's Oregon Project, while the World Anti-Doping Agency and UK Anti-Doping Agency have confirmed athletes formerly coached by the American - including 2012 and 2016 Olympic gold medallist Mo Farah - are set to be investigated.

Salazar previously stated he would be appealing the ban, and CAS has now announced two cases have been opened, though it appears the hearings will not go ahead until March 2020 at the earliest.

"CAS has registered the appeals filed by Mr Alberto Salazar and Dr Jeffrey Brown against USADA in relation to the decisions rendered by the American Arbitration Association, North American Court of Arbitration for Sport Panel on 30 September 2019 and 7 October 2019 respectively, in which they were found to have committed anti-doping rule violations and sanctioned with a four-year period of ineligibility," a statement read.

"Two CAS arbitration procedures have been opened. The parties have requested additional time to file their written submissions and evidence.

"Accordingly, at this stage, it appears that the hearings in these two matters are unlikely to take place before March 2020."

UK Anti-Doping (UKAD) says it will review whether any action is required against British athletes who were trained by the now banned coach Alberto Salazar.

The organisation released a statement on Tuesday after the World Anti-Doping Agency (WADA) announced that it would investigate Salazar's former pupils.

Salazar was banned from coaching during the World Athletics Championships in Doha, after he – along with Dr Jeffrey Brown – was found guilty of possessing and trafficking banned substances after a four-year investigation by the US Anti-Doping Agency (USADA).

The verdict preceded Salazar's Nike Oregon Project being shut down, though the 61-year-old stated he will appeal his four-year ban.

Farah, who Salazar helped become the most successful British track athlete in modern Olympic Games history, claimed in October that there was an "agenda" against him after he was questioned over his former coach's actions.

But he will be one of the athletes to come under the spotlight of UKAD's review.

"We have been working with USADA on their investigation into the Nike Oregon Project and will work with WADA on their investigation if there is any evidence that relates to athletes or athlete support personnel under our jurisdiction," UKAD chief executive Nicole Sapstead said in a statement.

"We are reviewing the decision regarding Alberto Salazar to determine if there is any action we may wish to take as a national anti-doping organisation."

Farah has always maintained his innocence and has not been found guilty of any wrongdoing. 

Mo Farah and other athletes who trained under Alberto Salazar are to be investigated by the World Anti-Doping Agency (WADA).

Salazar was banned from coaching during the World Athletics Championships in Doha, after he – along with Dr Jeffrey Brown – were found guilty of possessing and trafficking banned substances after a four-year investigation by the US Anti-Doping Agency.

The verdict resulted in Salazar's Nike Oregon Project being shut down, though the 61-year-old stated he will appeal his four-year ban.

Farah, who Salazar helped become the most successful British track athlete in modern Olympic Games history, claimed in October that there was an "agenda" against him after he was questioned over his former coach's actions.

However, Farah – along with athletes who previously worked with Salazar – will now be scrutinised by WADA, according to its president Craig Reedie.

"The clear question is did any of the allegations concerning Salazar and his operations result in athletes cheating themselves, which might have influenced their performance and might have involved the winning of competitions," Reedie told BBC Sport.

"We need to look at that and we will."

Brigid Kosgei smashed Paula Radcliffe's world record as the Kenyan star became the quickest woman to run a marathon in Chicago on Sunday.

Radcliffe's time of two hours, 15 minutes 25 seconds stood for 16 years, but Kosgei eclipsed the Briton's effort in monumental style on Sunday as she successfully defended her Chicago title.

A day after Eliud Kipchoge became the first person to run a marathon in under two hours, Kosgei recorded a remarkable time of 2:14:04 to shatter Radcliffe's record by 71 seconds.

The 25-year-old - the youngest winner of the London Marathon - was congratulated by Radcliffe at the finish line as her sensational year reached new heights.

Ababel Yeshaneh came second with a personal best of 2:20:51, almost seven minutes behind Kosgei, with fellow Ethiopian Gelete Burka completing the top three.

"I'm feeling good, happy, I was not expecting to run like this," Kosgei said. "The course was good - a little bit of wind, which pushed us a bit, but it was okay."

Kosgei's incredible run completed a supreme double for Kenya, with Lawrence Cherono winning the men's race.

Ethiopia's Dejene Debela looked well placed to clinch victory when he made a break for the line in the last kilometre, but he went too early.

Cherono took full advantage, driving clear in the final stretch to cross the line with the clock on 2:05:45. Asefa Mengstu came third.

However, it was a frustrating day for 2018 champion Mo Farah, who recorded his worst marathon run in six races at the culmination of a difficult week.

Farah - who accused the media of having a "clear agenda" against him when he was questioned over the conduct of his former coach Alberto Salazar, who has been banned for four years after being found guilty of doping violations - completed the race in eighth with a time of 2:09:58.

Mo Farah said he is happy to be tested "anytime and anywhere" in a terse conversation with reporters as he made his first public comments since former coach Alberto Salazar was handed a four-year ban for doping violations.

The United States Anti-Doping Agency (USADA) last week sanctioned Salazar and Dr Jeffrey Brown for "orchestrating and facilitating prohibited doping conduct while acting, respectively, as head coach of the Nike Oregon Project [NOP] and as a paid consultant for the NOP on performance enhancement and as physician for numerous athletes in the NOP".

Farah worked with Salazar, who strenuously denied any wrongdoing and plans to appeal the ban, from 2011 until 2017, a period in which the British long-distance runner won four Olympic gold medals.

Two independent three-member panels of the American Arbitration Association (AAA) found Salazar and Brown "possessed and trafficked a banned performance-enhancing substance and administered or attempted to administer a prohibited method to multiple track and field athletes", while the panel also found that both "committed tampering and complicity violations".

The allegations surrounding Salazar first surfaced in 2015. Farah has never been accused of any wrongdoing.

"At the time there was no allegation against me," Farah said ahead of the Chicago Marathon. "There were allegations against Alberto Salazar.

"I want to be clear and I'll be honest as I have since day one. I was out in Birmingham racing. I pulled out of the race in 2015.

"I flew to Portland to get some answers from Alberto. I talked to him face to face and he assured me at the time that it was just an allegation, this is not true, there are no allegations against you, Mo.

"He promised me and that hasn't been true.

"Why is my name in the headlines? I haven't done anything wrong. These allegations are about Alberto Salazar not Mo Farah.

"I haven't failed any tests. I'm happy to be tested anytime and anywhere. My tests can be used as samples and research. There is no more I can do.

"I have no tolerance for anyone who crosses the line. I have said that from day one.

"There is a clear agenda to this. I have seen it many times. I have seen it with Raheem Sterling. I’ve seen it with Lewis Hamilton. I can't win whatever I do."

Nike has elected to close down the Oregon Project in the wake of the suspension. 

Asked about that decision, Farah replied: "I've been out of the Oregon Project for two years, basing myself in London to focus on the marathon.

"It's not my decision to shut down the Oregon Project. It's Nike's decision – I'm Mo Farah."

Four-time Olympic champion Mo Farah has insisted he has "no tolerance for anyone who breaks the rules" after his former coach Alberto Salazar was handed a four-year suspension by the United States Anti-Doping Agency.

USADA found Salazar and Dr Jeffrey Brown guilty of multiple doping violations during their time working at the Nike Oregon Project (NOP).

Two independent three-member panels found Salazar and Brown trafficked the banned performance-enhancing drug testosterone and attempted to administer a prohibited method to multiple track and field athletes.

Salazar was also found to have "tampered and/or attempted to tamper with the doping control process".

In a statement via the NOP website, Salazar said he was "shocked" by an "unfair" outcome to the investigation and claimed USADA had subjected him to "unjust, unethical and highly damaging treatment".

The 61-year-old coached Farah for six years until their split in 2017, during which time the British long-distance star completed Olympic doubles at 5000m and 10000m in 2012 and 2016.

Reacting to Salazar's punishment, Farah expressed relief that a conclusion had been reached.

"I'm relieved USADA has, after four years, completed their investigations into Alberto Salazar," the 36-year-old said in a statement.

"I left the Nike Oregon Project in 2017 but, as I've always said, I have no tolerance for anyone who breaks the rules or crosses a line.

"A ruling has been made and I'm glad there has finally been a conclusion."

Following USADA's ruling, the IAAF circulated a short statement in which it confirmed Salazar's accreditation for its ongoing World Athletics Championships in Doha had been revoked.

Farah began working with Salazar in the same year he claimed a first global title by winning the 5000m at the 2011 World Championships.

He took silver in the 10000m and, in between his corresponding Olympic heroics, won the long-distance double at both the 2013 and 2015 World Championships.

Another worlds gold followed in the 10000m at London 2017, although he was forced to settle for 5000m silver.

After the event, Farah announced his relocation to the English capital to work under coach Gary Lough – his focus shifting full-time to marathon running – but maintained the switch was nothing to do with doping allegations hanging over Salazar.

UK Athletics conducted a review of Farah's working relationship with Salazar in 2015 following allegations made against the coach by BBC's Panorama programme. It found "no reason" to doubt its confidence in the NOC.

A statement issued by UK Athletics on Tuesday read: "The Board of UK Athletics acknowledges the announcement made by USADA concerning the four-year sanction imposed on Alberto Salazar.

"The Board and Performance Oversight Committee (POC) will now review the arbitration decision in full prior to making any further comment.

"It should be noted that at all times UK Athletics fully cooperated with both USADA and UKAD throughout the investigations. Furthermore the Performance Oversight Committee's own investigation in 2015 was restricted to the interaction of the Nike Oregon Project with Mo Farah. and not an anti-doping investigation.

"Such investigations can and should only be undertaken by the relevant anti-doping authorities.

"UK Athletics is 100 per cent committed to clean athletics through investment in athlete education, supporting comprehensive testing programmes, and full cooperation with both UK and International Anti-Doping Authorities."

Alberto Salazar said he is "shocked" by his four-year athletics suspension for multiple anti-doping violations, which Mo Farah's former coach intends to appeal.

The United States Anti-Doping Agency (USADA) announced the suspension on Monday, with Salazar and Dr Jeffrey Brown sanctioned for "orchestrating and facilitating prohibited doping conduct while acting, respectively, as head coach of the Nike Oregon Project [NOP] and as a paid consultant for the NOP on performance enhancement and as physician for numerous athletes in the NOP".

Salazar worked with long-distance star Farah from 2011 until 2017, a period in which the British runner won four Olympic gold medals.

Two independent three-member panels of the American Arbitration Association (AAA) found Salazar and Brown "possessed and trafficked a banned performance-enhancing substance and administered or attempted to administer a prohibited method to multiple track and field athletes", while the panel also found that both "committed tampering and complicity violations".

Salazar released a statement in response, which read: "I am shocked by the outcome today. Throughout this six-year investigation my athletes and I have endured unjust, unethical and highly damaging treatment from USADA. 

"This is demonstrated by the misleading statement released by Travis Tygart stating that we put winning ahead of athlete safety.

"This is completely false and contrary to the findings of the arbitrators, who even wrote about the care I took in complying with the World Anti-Doping code:

"'The panel notes that the respondent does not appear to have been motivated by any bad intention to commit the violations the panel found. In fact, the panel was struck by the amount of care generally taken by respondent to ensure that whatever new technique or method or substance he was going to try was lawful under the World Anti-Doping Code, with USADA's witness characterizing him as the coach they heard from the most with respect to trying to ensure that he was complying with his obligations'.

"I have always ensured the WADA code is strictly followed. The Oregon Project has never and will never permit doping. I will appeal and look forward to this unfair and protracted process reaching the conclusion I know to be true. I will not be commenting further at this time."

Mo Farah's former coach Alberto Salazar has been banned from athletics for four years after multiple anti-doping violations.

The United States Anti-Doping Agency (USADA) announced the suspension on Monday, with Salazar and Dr Jeffrey Brown sanctioned for "orchestrating and facilitating prohibited doping conduct while acting, respectively, as head coach of the Nike Oregon Project [NOP] and as a paid consultant for the NOP on performance enhancement and as physician for numerous athletes in the NOP".

Salazar worked with Farah from 2011 until 2017, during a period in which the British runner won four Olympic gold medals before the pair split two years ago.

Two independent three-member panels of the American Arbitration Association (AAA) found Salazar and Brown "possessed and trafficked a banned performance-enhancing substance and administered or attempted to administer a prohibited method to multiple track and field athletes", while the panel also found that both "committed tampering and complicity violations".

"The athletes in these cases found the courage to speak out and ultimately exposed the truth," said USADA chief executive officer Travis T. Tygart.

"While acting in connection with the Nike Oregon Project, Mr. Salazar and Dr. Brown demonstrated that winning was more important than the health and wellbeing of the athletes they were sworn to protect."

Salazar had denied any wrongdoing in relation to accusations of doping levelled at him by a BBC investigation, which emerged in 2015.

British long-distance star Farah eventually split from Salazar in October 2017 due to his move back to London, ending a partnership of six years.

"I'm moving back home, London, I really miss home," Farah – who won the 5,000m and 10,000m at London 2012 and Rio 2016 – said in a video posted on Twitter at the time.

"Seeing my kids the way they were in the summer at the World Championships, I'm going to be back there. I'm very excited.

"Also, I'll no longer be coached by Alberto Salazar... My new coach is going to be Gary Lough, who coached Paula Radcliffe through her marathon."

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