He was provisionally suspended but challenged the decision and was able to continue playing.
Sinner’s defence said he was inadvertently contaminated by the banned substance by his physiotherapist, Giacomo Naldi.
The ITIA accepted Sinner’s explanation that Naldi had applied an over-the-counter spray – widely available in Italy – which contained clostebol to treat a cut on Sinner’s hand.
An independent tribunal ruled that Sinner was not to blame, but stripped him of his ranking points and prize money for reaching the Indian Wells semi-finals.
He has since stopped working with Naldi.
Sinner won the US Open in New York this month, 19 days after he was cleared.
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