CAS clears Japan’s Koki Ikeda of doping violation and overturns four-year ban

The Court of Arbitration for Sport (CAS) has overturned a four-year ban imposed on Japanese race walker Koki Ikeda, clearing the Tokyo Olympic silver medallist of an anti-doping rule violation and restoring his immediate eligibility to compete.

The decision, announced on Friday, followed an appeal by the 28-year-old against World Athletics, which had accused him of using or attempting to use a prohibited substance.

Ikeda was provisionally suspended in November 2024 before receiving a four-year sanction from the Athletics Integrity Unit (AIU) in February 2025.

The Japanese athlete challenged the ruling at CAS in March 2025, firmly denying the allegations against him.

CAS Finds a Reasonable Explanation for Abnormal Blood Readings

The original case against Ikeda centred on suspected blood manipulation, with World Athletics relying on abnormalities identified in his Athlete Biological Passport (ABP).

The passport tracks an athlete’s biological markers over time to help identify potential signs of doping.

Following the initial ruling, Ikeda took his case to CAS, with a hearing held before a panel in Lausanne in May.

Although the panel acknowledged that several readings in the athlete’s biological profile were abnormal, it concluded that there was a reasonable explanation for the findings that did not involve doping.

CAS noted that Ikeda had presented substantial medical evidence and expert testimony in support of his appeal. This material provided a broader factual basis for assessing his biological profile than had been available during the original proceedings before the World Athletics tribunal.

Four-Year Suspension Overturned

After reviewing the evidence, the CAS appeal panel overturned Ikeda’s four-year suspension, ruling that the alleged anti-doping violation had not been established.

The decision means that Ikeda is immediately eligible to compete again, bringing an end to the suspension imposed in February 2025.

The ruling represents a significant development for the Japanese race walker, who won the silver medal in the men’s 20km race walk at the Tokyo 2020 Olympic Games, held in 2021.

The case also highlights the importance of evaluating biological passport abnormalities alongside medical evidence and other relevant circumstances when determining whether an anti-doping violation has occurred.

With the sanction overturned, Ikeda can now look towards a return to competition as he seeks to rebuild his career on the international race-walking circuit.