Kazan: China's world record-holder and Olympic champion Sun Yang confirmed his shock withdrawal from Sunday's world championship 1500m freestyle final was down to a heart problem.
The 23-year-old said he made the decision to pull out shortly before being called to the Kazan pool having felt unwell during the warm-up.
Sun, who also found himself Sunday at the centre of claims he was involved in a physical confrontation with a female Brazilian swimmer, explained he started feeling problems with his heart after retaining his 800m freestyle title on Wednesday.
The same problem in his chest returned while he warmed up for Sunday's 1500m final.
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